1. N.A.J. Hastings and J.B. Peacock, Statistical distributions (Bullerworths, London, 1974).
2. D.E. Knuth, The art of computer programming. Volume 1: fundamental algorithms (Addison Wesley, Reading, MA, 1968).
3. N.J. Nilsson, Problem solving methods in artificial intelligence (McGraw-Hill, New York, 1971).
4. A.J. Scott, Combinatorial programming, spatial analysis and planning (Methuen, London, 1971).
5. P.D. Stephens, “The IMP language and compiler,” Computer Journal 17 (1974) 216–233.