M. Laumanns, R. Rudolph, and H. Schwefel. Proceedings of the 7th International Mendel Conference on Soft Computing, page 24-29. Brno, CZ, Mendel, (2001)
E. Takashima, Y. Murata, N. Shibata, and M. Ito. 2003 Congress on Evolutionary Computation (CEC'2003), page 1072--1079. IEEE Press, Piscataway, NJ, (2003)