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name="sf" class="address"><option value="">- el último primero -</option><option value="title">título</option><option value="author">autor</option><option value="reportnumber">número de reporte</option><option value="year">año</option></select><select name="so" class="address"><option value="a">asc.</option><option value="d">desc.</option></select> <select name="rm" class="address"><option value="">- o ordenar por -</option><option value="rrm">recommendations </option><option value="wrd">similitud de palabras</option></select></td> <td class="searchboxbody"><select name="rg" class="address"><option value="10" selected="selected">10 resultados</option><option value="25">25 resultados</option><option value="50">50 resultados</option><option value="100">100 resultados</option><option value="250">250 resultados</option><option value="500">500 resultados</option></select><select name="sc" class="address"><option value="1">reagrupar por colección</option><option value="0">lista única</option></select></td> <td class="searchboxbody"><select name="of" class="address"><option value="hb">HTML breve</option></select></td> </tr> </tbody> </table> <!--/create_searchfor_advanced()--> <table cellspacing="0" cellpadding="0" border="0" class="narrowandfocusonsearchbox"> <tr> <td valign="top"><table class="narrowsearchbox"> <thead> <tr> <th colspan="2" align="left" class="narrowsearchboxheader"> Búsqueda por colección: </th> </tr> </thead> <tbody><tr><td class="narrowsearchboxbody" valign="top"><input type="checkbox" name="c" value="NA63 Papers" checked="checked" /></td><td valign="top"><span class="collection-first-level"><a href="/collection/NA63%20Papers?ln=es&as=1">NA63 Papers</a> <small class="nbdoccoll">(21)</small></span> </td></tr><tr><td class="narrowsearchboxbody" valign="top"><input type="checkbox" name="c" value="NA63 Conference papers" checked="checked" /></td><td valign="top"><span class="collection-first-level"><a 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