S. Roberts, and D. Howard. Evolutionary Image Analysis, Signal Processing and
Telecommunications: First European Workshop, EvoIASP'99
and EuroEcTel'99, volume 1596 of LNCS, page 110--125. Goteborg, Sweden, Springer-Verlag, (28-29 May 1999)
S. Perkins. Late Breaking Papers at the 1997 Genetic Programming
Conference, page 296. Stanford University, CA, USA, Stanford Bookstore, (13--16 July 1997)