http://qiserver.ugr.es/cod/4503881.cif
http://qiserver.ugr.es/cod/4503882.cif
http://qiserver.ugr.es/cod/4503883.cif
http://qiserver.ugr.es/cod/4503884.cif
http://qiserver.ugr.es/cod/4503885.cif
http://qiserver.ugr.es/cod/4503886.cif
http://qiserver.ugr.es/cod/4503887.cif