M. Fukumi, and S. Omatu. Proceedings of the IEEE International joint Conference on Neural
Networks 1993, IJCNN'93, 3, page 2109--2112. IEEE Computer Society, (1993)
S. Ok, K. Miyashita, and K. Hase. Proceedings of the 2001 Congress on Evolutionary
Computation CEC2001, page 1025--1032. COEX, World Trade Center, 159 Samseong-dong,
Gangnam-gu, Seoul, Korea, IEEE Press, (27-30 May 2001)