Long Zhang Zhenan Sun Tieniu Tan Shungeng Hu Robust Biometric Key Extraction Based on Iris Cryptosystem. 1060-1069 2009 ICB http://dx.doi.org/10.1007/978-3-642-01793-3_107 conf/icb/2009 db/conf/icb/icb2009.html#ZhangSTH09