http://qiserver.ugr.es/cod/7203907.cif
http://qiserver.ugr.es/cod/7203908.cif
http://qiserver.ugr.es/cod/7203909.cif
http://qiserver.ugr.es/cod/7203969.cif
http://qiserver.ugr.es/cod/7204028.cif
http://qiserver.ugr.es/cod/7204029.cif