1 C.. Benkert, M.O. Scully, J.. Bergou, L.. Davidovich, M.. Hillery, and M.. Orszag, Physical Review A 41, (1990).
1 D.Z. Anderson, C.. Benkert, and D.. Crouch, in Neural Networks for Perception (Harcourt Brace & Co., Orlando, FL, USA, 1992), pp. 214–252.