<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mario J. Pérez-Jiménez</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Teoría de Clases y Conjuntos</style></title></titles><dates><year><style  face="normal" font="default" size="100%">1988</style></year></dates><publisher><style face="normal" font="default" size="100%">Editorial Edunsa</style></publisher><pages><style face="normal" font="default" size="100%">XVIII+582</style></pages><isbn><style face="normal" font="default" size="100%">84-7747-000-6</style></isbn></record></records></xml>