C. Hafner, and J. Frohlich. Proceedings of the Congress on Evolutionary
Computation, 1, page 287--294. Mayflower Hotel, Washington D.C., USA, IEEE Press, (6-9 July 1999)
C. Keber, and M. Schuster. GECCO 2002: Proceedings of the Genetic and
Evolutionary Computation Conference, page 74--81. New York, Morgan Kaufmann Publishers, (9-13 July 2002)