1. R. Andrist, http://www.geocities.com/rba_schach2000/, WILHELM download, 2004.
2. M.S. Bourzutschky, Private communications to the other authors, 2003.
3. Strategies for constrained optimisation;Haworth;ICGA J.,2000
4. Depth by the rule;Haworth;ICGA J.,2001
5. Reference fallible endgame play;Haworth;ICGA J.,2003