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<!doctype html><html><head><title>Google Scholar</title><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="referrer" content="always"><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=2"><meta name="format-detection" content="telephone=no"><link rel="shortcut icon" href="/favicon.ico"><meta name="google-site-verification" content="Y8J1_s45IeTudoUMT5t7AB5kel7unVEK-WjxXG4nPkQ"><link rel="canonical" href="https://scholar.google.com/"><meta name="description" content="Mit Google Scholar können Sie ganz einfach nach wissenschaftlicher Literatur suchen. 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Versuchen Sie es später erneut.</div><div id="gs_md_s"></div><div data-h="0" class="gs_md_wnw gs_md_ds gs_md_wmw"><div id="gs_asd" class="gs_md_d gs_md_ds gs_ttzi" role="dialog" tabindex="-1" aria-labelledby="gs_asd-t" data-ifc="gs_asd_q" data-wfc="gs_asd-x"><div class="gs_md_hdr"><a href="javascript:void(0)" id="gs_asd-x" role="button" aria-label="Abbrechen" data-mdx="gs_asd" class="gs_btnCLS gs_md_x gs_md_hdr_c gs_in_ib gs_btn_lrge"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl"></span></a><h2 id="gs_asd-t" class="gs_md_hdr_t">Erweiterte Suche</h2><div class="gs_md_hdr_b"><button type="button" id="gs_asd_psb" aria-label="Suche" class="gs_btnG gs_in_ib gs_btn_act gs_btn_half gs_btn_lsb"><span class="gs_wr"><span class="gs_ico"></span><span class="gs_lbl"></span></span></button></div></div><div id="gs_asd-bdy" class="gs_md_bdy"><style>#gs_asd{width:80%;max-width:552px;}.gs_el_ph #gs_asd{width:100%;max-width:100%;}#gs_asd_frm{margin-top:-6px;}.gs_el_tc #gs_asd_frm{margin-top:-8px;}.gs_asd_tr{clear:both;}.gs_el_tc .gs_asd_tr{padding:8px 0;}.gs_el_tc .gs_asd_tr:first-child{padding-bottom:0;}.gs_asd_dt{float:left;width:190px;padding:6px 2px 2px;}.gs_el_tc .gs_asd_dt{float:none;width:auto;padding:0 0 4px 0;}.gs_asd_dd{margin-left:194px;padding:2px;}.gs_el_tc .gs_asd_dd{margin-left:0;padding:0;}.gs_asd_yri .gs_in_txt{width:48px;}.gs_el_ph #gs_asd input,.gs_el_ph #gs_asd label{-webkit-tap-highlight-color:rgba(0,0,0,0);}.gs_asd_occtr{padding:5px 0;}.gs_el_tc .gs_asd_occtr{padding:0;}</style><form id="gs_asd_frm" class="gs_scl" action="/scholar"><div class="gs_asd_tr"><div class="gs_asd_dt" id="gs_asd_dt_t"><b>Artikel finden</b></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_q">mit <b>allen</b> Wörtern</label></div><div class="gs_asd_dd"><div class="gs_in_txtw gs_in_txtm gs_in_txtb"><input type="text" class="gs_in_txt" name="as_q" value="" id="gs_asd_q" autocapitalize="off"><div class="gs_in_txts"></div></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_epq">mit der <b>genauen Wortgruppe</b></label></div><div class="gs_asd_dd"><div class="gs_in_txtw gs_in_txtm gs_in_txtb"><input type="text" class="gs_in_txt" name="as_epq" value="" id="gs_asd_epq" autocapitalize="off"><div class="gs_in_txts"></div></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_oq">mit <b>irgendeinem</b> der Wörter</label></div><div class="gs_asd_dd"><div class="gs_in_txtw gs_in_txtm gs_in_txtb"><input type="text" class="gs_in_txt" name="as_oq" value="" id="gs_asd_oq" autocapitalize="off"><div class="gs_in_txts"></div></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_eq"><b>ohne</b> die Wörter</label></div><div class="gs_asd_dd"><div class="gs_in_txtw gs_in_txtm gs_in_txtb"><input type="text" class="gs_in_txt" name="as_eq" value="" id="gs_asd_eq" autocapitalize="off"><div class="gs_in_txts"></div></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_occt">die meine Wörter enthalten</label></div><div class="gs_asd_dd"><div class="gs_asd_occtr"><span class="gs_in_ra" onclick="void(0)"><input type="radio" name="as_occt" value="any" id="gs_asd_occt_a" checked><label for="gs_asd_occt_a">irgendwo im Artikel</label><span class="gs_chk"></span><span class="gs_cbx"></span></span></div><div class="gs_asd_occtr"><span class="gs_in_ra" onclick="void(0)"><input type="radio" name="as_occt" value="title" id="gs_asd_occt_t"><label for="gs_asd_occt_t">im Titel des Artikels</label><span class="gs_chk"></span><span class="gs_cbx"></span></span></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_sau">Artikel zurückgeben, die von folgendem Autor <b>verfasst</b> wurden:</label></div><div class="gs_asd_dd"><div class="gs_in_txtw gs_in_txtm gs_in_txtb"><input type="text" class="gs_in_txt" name="as_sauthors" value="" id="gs_asd_sau" autocapitalize="off"><div class="gs_in_txts"></div></div><div>z. B. <i>"Stephen Hawking"</i> oder <i>Hawking</i></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_pub">Artikel zurückgeben, die hier <b>veröffentlicht wurden</b>:</label></div><div class="gs_asd_dd"><div class="gs_in_txtw gs_in_txtm gs_in_txtb"><input type="text" class="gs_in_txt" name="as_publication" value="" id="gs_asd_pub" autocapitalize="off"><div class="gs_in_txts"></div></div><div>z. B. <i>NJW</i> oder <i>Nature</i></div></div></div><div class="gs_asd_tr"><div class="gs_asd_dt"><label for="gs_asd_ylo">Artikel zurückgeben, die in folgendem <b>Zeitraum</b> geschrieben wurden:</label></div><div class="gs_asd_dd"><div class="gs_asd_yri"><div class="gs_in_txtw gs_in_txtm"><input type="text" class="gs_in_txt" name="as_ylo" value="" id="gs_asd_ylo" size="4" maxlength="4" autocapitalize="off" pattern="[0-9]*"><div class="gs_in_txts"></div></div> — <div class="gs_in_txtw gs_in_txtm"><input type="text" class="gs_in_txt" name="as_yhi" value="" id="gs_asd_yhi" size="4" maxlength="4" autocapitalize="off" pattern="[0-9]*"><div class="gs_in_txts"></div></div></div><div>z.B. <i>1996</i></div></div></div><input type=hidden name="hl" value="de"><input type=hidden name="as_sdt" value="0,5"></form></div></div></div><div data-h="367" class="gs_md_wnw gs_md_ds gs_md_wmw"><div id="gs_md_albl-d" class="gs_md_d gs_md_ds gs_ttzi" role="dialog" tabindex="-1" aria-labelledby="gs_md_albl-d-t" data-wfc="gs_md_albl-d-x"><div class="gs_md_hdr"><a href="javascript:void(0)" id="gs_md_albl-d-x" role="button" aria-label="Abbrechen" data-mdx="gs_md_albl-d" class="gs_btnCLS gs_md_x gs_md_hdr_c gs_in_ib gs_btn_lrge"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl"></span></a><h2 id="gs_md_albl-d-t" class="gs_md_hdr_t">In „Meine Bibliothek“ gespeichert</h2><div class="gs_md_hdr_b"></div></div><div id="gs_md_albl-d-bdy" class="gs_md_bdy"></div><div class="gs_md_ftr"><div class="gs_lbl_btns"><button type="button" id="gs_lbd_apl" class=" gs_btn_act gs_btn_lrge"><span class="gs_wr"><span class="gs_lbl">Fertig</span></span><span class="gs_bs"></span></button><button type="button" id="gs_lbd_trash" class=" gs_btn_olact gs_btn_lrge"><span class="gs_wr"><span class="gs_lbl">Artikel entfernen</span></span><span class="gs_bs"></span></button></div></div></div></div><div id="gs_hdr_drw" class="gs_md_ulr gs_md_ds" role="dialog" tabindex="-1" data-shd="gs_hdr_drs" data-wfc="gs_hdr_drw_mnu" data-cfc="gs_hdr_mnu"><div id="gs_hdr_drw_in"><div id="gs_hdr_drw_top"><a href="javascript:void(0)" id="gs_hdr_drw_mnu" role="button" aria-controls="gs_hdr_drw" aria-label="Optionen" class="gs_btnMNT gs_in_ib gs_btn_lrge"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl"></span></a><a id="gs_hdr_drw_lgo" href="/schhp?hl=de&as_sdt=0,5" aria-label="Startseite"></a></div><div><div class="gs_hdr_drw_sec"><a href="/citations?hl=de" role="menuitem" class="gs_btnPRO gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Mein Profil</span></a><a href="/scholar?scilib=1&hl=de&as_sdt=0,5" role="menuitem" class="gs_btnL gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Meine Bibliothek</span></a><a href="/scholar_alerts?view_op=list_alerts&hl=de" role="menuitem" class="gs_btnM gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Benachrichtigungen</span></a><a href="/citations?view_op=metrics_intro&hl=de" role="menuitem" class="gs_btnJ gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Kennzahlen</span></a></div><div class="gs_hdr_drw_sec"><a href="javascript:void(0)" id="gs_hp_drw_adv" role="menuitem" class="gs_btnADV gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Erweiterte Suche</span></a></div><div class="gs_hdr_drw_sec"><a href="/scholar_settings?sciifh=1&hl=de&as_sdt=0,5" role="menuitem" class="gs_btnP gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Einstellungen</span></a></div></div><div id="gs_hdr_drw_bot" class="gs_hdr_drw_sec"><a href="https://accounts.google.com/Login?hl=de&continue=https://scholar.google.com/%3Fhl%3Dde%26as_sdt%3D0,5" class=" gs_in_ib gs_md_li gs_md_lix gs_in_gray"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Anmelden</span></a></div></div></div><div id="gs_hdr" role="banner"><a href="javascript:void(0)" id="gs_hdr_mnu" role="button" aria-controls="gs_hdr_drw" class="gs_btnMNT gs_in_ib gs_btn_lrge"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl"></span></a><a id="gs_hdr_lgo" class="gs_hdr_dso" href="/schhp?hl=de&as_sdt=0,5" aria-label="Startseite"></a><div id="gs_hdr_md"><div id="gs_hdr_hpl"><a href="/citations?hl=de" class="gs_btnPRO gs_in_ib"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Mein Profil</span></a><a href="/scholar?scilib=1&hl=de&as_sdt=0,5" class="gs_btnL gs_in_ib gs_mylib"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">Meine Bibliothek</span></a></div><div id="gs_hdr_srch"><div id="gs_hdr_hp_lgow"><img id="gs_hdr_hp_lgo" src="/intl/de/scholar/images/1x/scholar_logo_64dp.png" srcset="/intl/de/scholar/images/2x/scholar_logo_64dp.png 1.5x"></div><form id="gs_hdr_frm" action="/scholar"><input type=hidden name="hl" value="de"><input type=hidden name="as_sdt" value="0,5"><div class="gs_in_txtw gs_in_txtb"><input type="text" class="gs_in_txt" name="q" value="" id="gs_hdr_tsi" size="50" maxlength="2048" autocapitalize="off" aria-label="Suche"><div class="gs_in_txts"></div></div><span id="gs_hdr_tsc"><span class="gs_ico gs_ico_X"></span></span><button type="submit" id="gs_hdr_tsb" name="btnG" aria-label="Suche" class="gs_btnG gs_in_ib gs_btn_act gs_btn_half gs_btn_lsb"><span class="gs_wr"><span class="gs_ico"></span><span class="gs_lbl"></span></span></button></form></div></div><div id="gs_hdr_act"><a id="gs_hdr_act_s" href="https://accounts.google.com/Login?hl=de&continue=https://scholar.google.com/%3Fhl%3Dde%26as_sdt%3D0,5">Anmelden</a></div></div><style>#gs_alrt{position:fixed;bottom:48px;left:16px;max-width:384px;z-index:1250;display:flex;justify-content:space-between;align-items:center;font-size:13px;line-height:16px;color:#e2e2e2;background:#333;text-align:left;border-radius:3px;box-shadow:0 3px 5px -1px rgba(0,0,0,.2),0 6px 10px 0 rgba(0,0,0,.14),0 1px 18px 0 rgba(0,0,0,.12);visibility:hidden;transform-origin:center;transform:scale(0.8,0.8) translate(0,100%);}.gs_el_ph #gs_alrt{bottom:0;left:0;width:100%;max-width:none;border-radius:0;box-shadow:none;transform:scale(1,1) translate(0,100%);}#gs_alrt.gs_vis{visibility:visible;transform:scale(1,1) translate(0,0);}#gs_alrt.gs_anm{transition:transform .067s cubic-bezier(.4,0,1,1),visibility 0s .067s;}#gs_alrt.gs_vis.gs_anm{transition:transform .067s cubic-bezier(0,0,.2,1);}.gs_el_ph #gs_alrt.gs_anm{transition:transform .084s cubic-bezier(.4,0,1,1),visibility 0s .084s;}.gs_el_ph #gs_alrt.gs_vis.gs_anm{transition:transform .1s cubic-bezier(0,0,.2,1);}#gs_alrt_m{display:block;padding:16px;}#gs_alrt_l{display:block;padding:8px;margin:0 8px 0 -8px;border-radius:3px;color:#fcc934;text-transform:uppercase;text-decoration:none;}#gs_alrt_l:hover{background-color:rgba(255,255,255,.05)}#gs_alrt_l:active{background-color:rgba(255,255,255,.1)}#gs_alrt_l:empty{display:none}#gs_alrt_m a{padding:8px 0;color:#e2e2e2;text-decoration:underline;}#gs_alrt_m a:active{color:#f6aea9}</style><form action="" method="post" id="gs_alrt"><span id="gs_alrt_m"></span><span id="gs_alrt_h"></span><a id="gs_alrt_l" href="javascript:void(0)" class="gs_fm_s" data-fm="gs_alrt"></a></form><div id="gs_bdy"><div id="gs_bdy_sb" role="navigation"><div id="gs_bdy_sb_in"></div></div><div id="gs_bdy_ccl" role="main"><div id="gs_hp_main"><div id="gs_hp_data" style="display:none" data-nrla="-1"></div><form id="gs_hp_frm" action="javascript:void(0)" role="presentation"><div id="gs_hp_lr"><span class="gs_hp_ra"><span class="gs_in_ra" onclick="void(0)"><input type="radio" name="lr" value="" id="gs_hp_lr0" checked><label for="gs_hp_lr0">Beliebige Sprache</label><span class="gs_chk"></span><span class="gs_cbx"></span></span></span> <span class="gs_hp_ra"><span class="gs_in_ra" onclick="void(0)"><input type="radio" name="lr" value="lang_de" id="gs_hp_lr1"><label for="gs_hp_lr1">Seiten auf Deutsch</label><span class="gs_chk"></span><span class="gs_cbx"></span></span></span></div></form><div><style>#gs_hp_ra{margin:26px auto 48px auto;max-width:579px;text-align:left;}.gs_el_tc #gs_hp_ra{margin:14px auto 48px auto;}.gs_el_ph #gs_hp_ra{margin:26px auto;}</style><div id="gs_hp_ra"></div><div><div id="gs_hp_giants" class="gs_grn gs_med">Auf den Schultern von Riesen</div></div></div><noscript><div style="margin:1em 0"><div class="gs_wrn gs_alrt"><div>Unter Umständen funktionieren einige Funktionen nicht, wenn JavaScript deaktiviert ist.</div><div>Für eine optimale Nutzererfahrung <a href="//support.google.com/answer/23852">aktivieren Sie bitte JavaScript</a> in Ihrem Browser.</div></div></div></noscript></div></div></div><div id="gs_ftr_sp" role="presentation"></div><div id="gs_ftr" class="gs_md_rmb" role="contentinfo"><style>#gs_lp{margin:0 8px;padding:12px 8px;}#gs_lp .gs_ico{left:auto;top:9px;}#gs_lp .gs_lbl{color:#666;}#gs_lp .gs_lbl:active{color:#d14836;}html:not(.gs_el_tc) #gs_lp_d{bottom:100%;position:absolute;top:auto;transition:all 0s;}html:not(.gs_el_tc) #gs_lp_d .gs_md_ulr{background:#fff;border-bottom:1px solid #e5e5e5;bottom:0;box-shadow:2px -2px 4px rgba(0,0,0,.15);position:absolute;width:100%;}#gs_lp_d .gs_md_ul{width:20%;}#gs_lp_d .gs_md_li{overflow:hidden;text-overflow:ellipsis;padding:8px 0 8px 24px;}.gs_el_tc #gs_lp_d{height:100%;position:fixed;top:0;visibility:hidden;width:100%;z-index:1200;left:0;}html:not(.gs_el_tc) #gs_lp_lbl{display:none;}.gs_el_tc #gs_lp_lbl{border-bottom:1px solid #e5e5e5;color:#666;font-size:20px;font-weight:normal;line-height:24px;padding:16px 0 16px 24px;}.gs_el_tc #gs_lp_d .gs_md_ul{display:block;width:100%;}.gs_el_tc #gs_lp_d .gs_md_li{padding-bottom:16px;padding-top:16px;}.gs_el_tc #gs_md_s.gs_lp_shd{transition:opacity .218s,visibility 0s .218s;}.gs_el_tc #gs_md_s.gs_lp_shd.gs_vis{transition:opacity .218s,visibility 0s;}html:not(.gs_el_tc) #gs_md_s.gs_lp_shd{display:none;}.gs_el_tc #gs_lp_d{background:#fff;box-shadow:2px 2px 4px rgba(0,0,0,.15);outline:none;overflow-y:scroll;transform:translate(-100%,0);transition:transform .3s cubic-bezier(.4,0,.6,1),visibility 0s .3s;width:300px;}.gs_el_tc #gs_lp_d.gs_vis{transform:translate(0,0);transition:transform .225s cubic-bezier(0,0,.2,1),visibility 0s;visibility:visible;}.gs_el_tc #gs_lp_d.gs_abt{transition:none;}.gs_lp_bb{border-bottom:1px solid #e5e5e5;margin-top:-1px;}</style><a href="javascript:void(0)" id="gs_lp" role="button" aria-controls="gs_lp_d" class="gs_btnPBL gs_in_ib"><span class="gs_ico"></span><span class="gs_ia_notf"></span><span class="gs_lbl">DE</span></a><div id="gs_lp_d" role="dialog" aria-labelledby="gs_lp_lbl" data-shd="gs_lp_shd" data-ifc="gs_lp_cur" data-wfc="gs_lp_d" data-cfc="gs_lp" class="gs_md_wnw gs_md_ds"><div class="gs_md_ul_tb gs_md_ulr"><h3 id="gs_lp_lbl">Sprachen</h3><div class="gs_md_ul"><a class="gs_md_li gs_sel" id="gs_lp_cur" aria-selected="true" role="menuitem" href="javascript:void(0)">Deutsch</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=en">English</a><a class="gs_md_li gs_lp_bb" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=zh-CN">中文 (简体)</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=ca">Català</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=cs">Čeština</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=da">Dansk</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=es">Español</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=tl">Filipino</a></div><div class="gs_md_ul"><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=fr">Français</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=hr">Hrvatski</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=id">Indonesia</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=it">Italiano</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=lv">Latviešu</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=lt">Lietuvių</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=hu">Magyar</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=nl">Nederlands</a></div><div class="gs_md_ul"><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=no">Norsk</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=pl">Polski</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=pt-BR">Português (Brasil)</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=pt-PT">Português (Portugal)</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=ro">Română</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=sk">Slovenčina</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=sl">Slovenščina</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=fi">Suomi</a></div><div class="gs_md_ul"><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=sv">Svenska</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=vi">Tiếng Việt</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=tr">Türkçe</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=el">Ελληνικά</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=bg">Български</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=ru">Русский</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=sr">Српски</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=uk">Українська</a></div><div class="gs_md_ul"><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=iw"><span dir=rtl>עברית</span>‎</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=ar"><span dir=rtl>ﺎﻠﻋﺮﺒﻳﺓ</span>‎</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=fa"><span dir=rtl>ﻑﺍﺮﺳی</span>‎</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=hi">हिन्दी</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=th">ไทย</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=ko">한국어</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=zh-TW">中文 (繁體)</a><a class="gs_md_li" role="menuitem" href="/scholar_setlang?scisig=AFWwaeYAAAAAZ0TWv4-TlamxI4IyMkWEyWaV9uY&as_sdt=0,5&hl=ja">日本語</a></div></div></div><div id="gs_ftr_rt"><a href="//www.google.com/intl/de/policies/privacy/">Datenschutzerklärung</a><a href="//www.google.com/intl/de/policies/terms/">Nutzungsbedingungen</a><a href="javascript:void(0)" ontouchstart="gs_evt_dsp(event)" role="button" aria-controls="gs_ftr_mnu" aria-haspopup="true" class="gs_press gs_md_tb">Hilfe</a></div><div id="gs_ftr_mnu" class="gs_md_d gs_md_ds gs_ttzi gs_md_ulr" role="menu" tabindex="-1"><a role="menuitem" href="/intl/de/scholar/about.html" tabindex="-1" class="gs_md_li">Über Google Scholar</a><a role="menuitem" href="//support.google.com/websearch?p=scholar_dsa&hl=de" tabindex="-1" class="gs_md_li">Google Suche-Hilfe</a></div></div></div></body></html>