Jiri Matas Miroslav Hamouz Kenneth Jonsson Josef Kittler Yongping Li Constantine Kotropoulos Anastasios Tefas Ioannis Pitas Teewoon Tan Hong Yan Fabrizio Smeraldi N. Capdevielle Wulfram Gerstner Yousri Abdeljaoued Josef Bigün S. Ben-Yacoub E. Mayoraz Comparison of Face Verification Results on the XM2VTS Database. 4858-4863 2000 ICPR http://doi.ieeecomputersociety.org/10.1109/ICPR.2000.903052 db/conf/icpr/icpr2000-4.html#MatasHJKLKTPTYSCGABBM00