Kaushik Roy Prabir Bhattacharya Nonideal Iris Recognition Using Level Set Approach and Coalitional Game Theory. 394-402 2009 ICVS http://dx.doi.org/10.1007/978-3-642-04667-4_40 conf/icvs/2009 db/conf/icvs/icvs2009.html#RoyB09