CINXE.COM
Just a moment...
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '91343258eea5fce0',cH: 'VT9WZV7aeOnsnriqpgYwNSpiMAI6ryL52iFR78MS_l4-1739778732-1.2.1.1-QjIRV.lFeD7eFFzlclQ9Q6TsxC1gy1.vIntFXgWBo8elxqvi6O9ugVgoEzMubD89',cUPMDTk: "\/search?q=Resource%20Discovery.&__cf_chl_tk=YBQZjHkGzA.4aIWrJeFVvaBmL.gs5K_OOYRkAsKAY7Q-1739778732-1.0.1.1-D3XZSj3goeODk6olT1Kv2G2sObBdxuy9Cch3HVtJlJY",cFPWv: 'b',cITimeS: '1739778732',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=Resource%20Discovery.&__cf_chl_f_tk=YBQZjHkGzA.4aIWrJeFVvaBmL.gs5K_OOYRkAsKAY7Q-1739778732-1.0.1.1-D3XZSj3goeODk6olT1Kv2G2sObBdxuy9Cch3HVtJlJY",md: "XrXySPO2Wt32NCqjm_MH0EAkwXMXbw2ycFbzuHZUUio-1739778732-1.2.1.1-CBtpLLUytbGW_XYeg0QnazprGOK13fQl_Sa.uraqudMmKeV8C4cBCPMgVgrIR9L2up0qTZ2beZI5WanfXjATY3MQV88677AixD2yvUjFLPfH6w9c4pIun6GnY6NLYmpTxk_lJAfwgIL5.SYueN0OwvXp.zIbHN1JHyZftEmOA.qCh8IJa6rAoGQNcJ_17e_rvfCSi5YFsrYZqN4U.q3mPqZrCLX4LNG0LVsDKj4NAEc_UR2vVU8MpLVmi8B.ATjSFBNmAacwkNsbMx3HUaZa8Yw6moMlFhxaJ1bTyga8ggMtzDexymAnckkXLrNIVr7_WYok5iON.sCxqbPIh5WIvtfMF_0Uno6SCyoaYPJkHnFqOKmCBT3loxnOeNscfT4oj76Lurfl2HyKD2VYPEWOBUowhzCv3X_rCoI_F5J_poOftY6lbn0.HJ8AgZ42COQxibDDJo17sqpGWxlJT8XPZAneHGnERlNzTGfH.kO2uV8MgCkTN6RXDGmGeSyyXEXebs.V5FXeJ7Eq4iHFjzI5iUf1BoU8VcemZlFrF9szckKMWQf3mwrbfylojzHhxvAYGGLPZs_fcNGHPMxq.6UFdrCEYK67fXwACnPbgeWpkcHoYg2fgvd1q5A6z9TOYDDFYouCGxk6gzHpG3YQ3CNfzLgcO_KXeWkJv1RnNhDcpw9VORIfR.Bp9y6ehNxm.6UbTx5JEbzxzGcpgchWjDOeOKV.o8G7v5M3V7nOreIn2yAkyvsBKXl9eYWwP5vn6MkN9wBRcvESmMDoEHgeKtrKE5YibtrX67layF0XOI6TzGLM2nOZkTv0KKxoY7S3ysYRRGSRef38HbKwbgbnOM.sRHgSKLoQewUjPniE5ik2FJFz6AiL_M32D_QRTQbngenhEcmmQyR1g1a.8t8GrpED0TLSOkpyTKIYmNKEUMar8OMm0ISXZaQY6pOdH3ZDGufTEjmLr25XdKV9Nwwh4oj7Pt0wQt2pvYu9MmY82aoXu_TeFQW2CWTpVpr.bEfEP3hrWtDpORUSnMvpyaLAL92Akyp8klkGdslFzj.zVOKWRV8xe.ZdJTQo_C6fuw.DxXIx1bW5ZsHx8YVcTuE6fB8553bsP1qiQ3_0uKsb5DTsYOB03Fww57f7UjTVLlv3D76QCpS8c7ULOfJyY_OVVr1V7ZyiLtyFaTwxa0zOVtPyjM8iEVtj2SYH2GYiAusK7wlcgHvGyRqOEkjbQ4luVcUqRnr.o9Zj4kU10wDqOgx5hcGIar5NUAcIJlZq1ErYc51tvQkXCa8OMYvGz7DrA4ZvtK8oqa.NNVbK4.PeEL05Do_.Uzcb.Nn1_tAvpyxl8VqerkFx.VjPD.E1RDHXjcDoBS26X3fyU5TwKheIriHI.GJGzWOe781a6ozWJt6BNWO6S2sT1uX0T0hM4hM7PZsuWcJJs.5yCJH283jkzJP66gU_UibwnRRBnYVw3I0t3q3kmpCv9dvM_GhCQZA3azjDJYmuAbJ0kJISA5EuckErxK9sTM3YnJ5Z5JSDmARNzsAaPT0CkQVFQSOPLB0M5avCUDHUlJqfmLvhLwVSCx19Wt0Gte_Nc5nsZViRGROE7fEPEy0RoPrwRbC_7JJF9vlqsvSUogpXwV9QPLyuenO0g1GGvtQrbTKf9DNLjriG4wCmA8GRfzGJTKa9_4J9VMUVCtuTjZ.b530p9pOFg86zk_IuRtrYV5v6OfMeBFrugeV9gkWQeIvkDh8v5d_sBNyZXno9vq4eSl_g.dgosJrAaTPI2ODblbVF2efH3dmY6B2tzNNkZtX2CoFzbRJmT6zlJP6Jb9bv87dUPp0c0szop0li.ACjUYua_LeBndzoQnTLXnaF0YCfIHmX_QXp5uqvIJM1vj0aOsm1zG5TgJvOYzxGIDzfbHhpdxTlAVDB3DzKt7Y1rQAuUU57DlLqFCPc1g",mdrd: "BNAqwPiZ4nu8r4hB4ho2FPeeXhpDNiPaELBGND9ILoQ-1739778732-1.2.1.1-yHObkVqElEYtBAbamVttWsdNOYG5wX9SUXsZO4P6i8LnbWYss6QaNav9b0a9KBaQkDgObDpihZiwjeeyjmpv8o2Pr7rfiGglqkLAsK9YJdE_sjDLngQPeTx7.LH6ENkY92LV73yp0Bjhu.3KUGGodcIDsQD1WzXQVZCwOAiemE7YJey2.Rsg8KPFvk_zyaPQsNJ2kF0E2HyYMdhuLNfQN_UgKZKwGCPVGWpwTRY.si0WbNuH6H.dbMtZGXQTp0jb52kIKuwa5dcG7ROt7nVDSHATcKqt7Ztcrk1lkcmtdt6hchmobTqJ1JKRutH9UEzi1hZJytd60w3GsYxKlVY_BwYUZsVMYxqtY1u2cg6f6FhKW04LMCfXbhq5EIjYAPZdbYBAPNJqD15.q1BGJdfFzCZGfRA0O72F4B5q3bbSihRYnGHQBi66vyaarwvfifyA8P637xAoA4x5O1T2RM9B9JiJ2Sqa41RxFO0_dhcrI4mQPwIhD2G6RwGuSOkEYPNPdl3HbdmbsOtx3NCeVajHDdo_KExcbypZP5REHALKwwC3QjCZm64r8z4axT3KGKD4qrhfvEb4r81pCYLXxUm87.Qvv4JITPHRYF_yGk0JKrzoODXSTVEQFbo3OqlWPqbnQk4kIKpRskxl9uOmssTHLc25yGt24hnDz2EBEk6z80ZrUsWfB3mFbEd2NPsRndhzGZ6qjM0Cdges7XYR8MYlaZ61grieEa9hqP8QRsU.pfqSQjTteoAM1ruPFg6BofnYKFXk3XbVrlaEoLUbAingg8mh9S9L_NkVwpTU7yCwCus5.M1gun5fiNNR.jp.0tS5FAeMmEyzB38sHQcyQolhFbrlGvZi3U4GnWBe62kujPX9AnqW55fkLgx_qUBrVihXSLCBdl07crJdBxfX1aMrA8_cI2D9d_F2RkcpjnOOyHyV9b4Bu7EMa.jikEz7ZzR_aXhx576Co9FsoHH1srCgZl31a4skBER_HBnW7HavQNtN0X3c6fGSlFSw.8_7.LW8PeHQoTo5.VYQ7W76Iyw4ML10KVTk8LWgNrG.3ftumaNAsDEPJPguHb9r7WUPf.ZPe84Nryx70F4txOt9evtq5JU61Hcjg05aoPQdfT50vy25h3xY9ppsyCwyxr5jTJZWTYQENRa8iMvC6jZHDzhfO.VeN_fW4hRR7H2Bwnkpz9b5Dq9HpSl12_hFoVSKXyOGM.3TYrefSljxGbj1LrlF6VkwI4H2Xdnyj4C81UYyZMceHSKOrSlSLbuCIeiAosFrcu7jh6S0IF_1NTEUidL07n1sCLy8YULOTy2iX8IjdO9VfZIcMmpyx1C.XyWyP10PuQAyUsKpPZwXdoJZjLpfqVNsjoQPY5dcXlaHh0ikUGRCxqT9hnNEDcsT6qu6B52QgLm0xZ.J4YsflanUdFf348_.E8i8dSeKFtGJXjDjfk_xnajZ69HcCnCt9Q50Q6gHcKeCUR6HalCEh9cDpnZpHWr49isv3LJTXstp54zVNoQu2OO5mplFEIhZVOWIV74yLTd.9xL5aIUqINOzRXTUeUWooeHMMkVeN8gUUHO8cZmSBycua.vM5ebEZYXWvJuBkRcAb6.oH9hhlZJXrJuMYCHm5Ho_Ni9Y7gU.6Wy1MPl4andLbEVPFV50iLtJfGFOIsClp_YT2S4QrNQaCmKiElDy.I1xPJ7Juagck0qePtvwrQ83HGlB63yS312xLIsh5IHy7EeTmr80Osw3.BUcA1U9WCliG2Cm6BMjkJRvse6KcKNBfkw2bhmyWX5yGDdBcW3fIej6qN5Cp9ULYgSk_mR0ZKs2oPXNZ1l8qoI4n21zxpMHpDCdj1tbszS6xubwuQRRDk_0Th.fvrkMn5HgF1EMoS0zGnl14lNyJU5D4tsCMQwiAL4xwyyB0Cn.dD4B_BIABvDY0XFPy.wsOogw.GycS2t1u6bx197iTTtImifbMQxjpWn_Bq.jdKyuMJZ."};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91343258eea5fce0';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=Resource%20Discovery.&__cf_chl_rt_tk=YBQZjHkGzA.4aIWrJeFVvaBmL.gs5K_OOYRkAsKAY7Q-1739778732-1.0.1.1-D3XZSj3goeODk6olT1Kv2G2sObBdxuy9Cch3HVtJlJY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>