Yu Chen Malek Adjouadi Changan Han Armando Barreto A New Unconstrained Iris Image Analysis and Segmentation Method in Biometrics. 13-16 2009 ISBI http://dx.doi.org/10.1109/ISBI.2009.5192971 conf/isbi/2009 db/conf/isbi/isbi2009.html#ChenAHB09