http://qiserver.ugr.es/cod/1537639.cif
http://qiserver.ugr.es/cod/1537640.cif
http://qiserver.ugr.es/cod/1537641.cif
http://qiserver.ugr.es/cod/1537642.cif
http://qiserver.ugr.es/cod/1537643.cif
http://qiserver.ugr.es/cod/1537644.cif