R. Popp, D. Montana, R. Gassner, G. Vidaver, and S. Iyer. IEEE International Conference on Systems, Man, and
Cybernetics, 3, page 2184--2189. San Diego, CA USA, IEEE, (11-14 October 1998)
V. Vassilev, J. Miller, and T. Fogarty. Proceedings of the Congress on Evolutionary
Computation, 2, Mayflower Hotel, Washington D.C., USA, IEEE Press, (6-9 July 1999)