CONF thimm-caip99-verif/IDIAP Evaluating the Complexity of Databases for Person Identification and Verification Thimm, Georg Ben-Yacoub, Souheil Luettin, Juergen EXTERNAL https://publications.idiap.ch/attachments/papers/1999/caip99.pdf PUBLIC 8th Int. Conf. Computer Analysis of Images and Patterns Lecture Notes in Computer Science 1999 Springer Verlag 49-56