Daugman, John, “Probing the Uniqueness and Randomness of IrisCodes: Results from 200 Billion Iris Pair Comparisons”, Proceedings of the IEEE 94, no. 11 (2006), pp. 1927–1935, http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=4052470&url=http%3A%2F% 2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D4052470.