http://qiserver.ugr.es/cod/2311081.cif
http://qiserver.ugr.es/cod/2311082.cif
http://qiserver.ugr.es/cod/2311083.cif
http://qiserver.ugr.es/cod/2311084.cif
http://qiserver.ugr.es/cod/2311085.cif
http://qiserver.ugr.es/cod/2311086.cif