http://qiserver.ugr.es/cod/6000420.cif
http://qiserver.ugr.es/cod/6000421.cif
http://qiserver.ugr.es/cod/6000422.cif
http://qiserver.ugr.es/cod/6000438.cif
http://qiserver.ugr.es/cod/6000439.cif
http://qiserver.ugr.es/cod/6000440.cif
http://qiserver.ugr.es/cod/6000441.cif
http://qiserver.ugr.es/cod/9012224.cif
http://qiserver.ugr.es/cod/9012225.cif