http://www.p212121.com/2010/04/12/theres-an-app-for-that/
http://jp-minerals.org/vesta/en/gallery.html
http://www.iycr2014.org/
http://www.webmineral.com/java/index.php?alpha=P#.UieJE97o6BO
http://edocet.naukas.com/2013/11/15/protocristalografia-del-homo-erectus-linneo/
http://edocet.naukas.com/2013/11/21/breve-historia-de-la-cristalografia-ii-las-rocas-con-lengua-y-la-orina-de-hooke/