Luan Ling Lee Toby Berger Erez Aviczer Reliable On-Line Human Signature Verification Systems. 643-647 1996 18 IEEE Trans. Pattern Anal. Mach. Intell. 6 http://doi.ieeecomputersociety.org/10.1109/34.506415 db/journals/pami/pami18.html#LeeBA96