http://qiserver.ugr.es/cod/1531715.cif
http://qiserver.ugr.es/cod/1531717.cif
http://qiserver.ugr.es/cod/1531718.cif
http://qiserver.ugr.es/cod/1531719.cif
http://qiserver.ugr.es/cod/1531721.cif
http://qiserver.ugr.es/cod/1533779.cif
http://qiserver.ugr.es/cod/1533783.cif