"İndigo-Kristal"

http://www.indigodergisi.com/indigolar.htm
http://www.indigodergisi.com/kalpsavascilari.htm
http://www.genbilim.com/component/option,com_smf/Itemid,114/topic,906.0
http://www.astroset.com/aktuel/indigo2.htm