@ARTICLE {5973, author={H. Proença and L.A. Alexandre}, doi={10.1109/TIFS.2011.2177659}, journal={IEEE Transactions on Information Forensics and Security}, title={Toward Covert Iris Biometric Recognition: Experimental Results From the NICE Contests}, year={2012}, month={April}, volume={7}, number={2}, pages={798-808}, ISSN={1556-6013} }