[comp.lang.lisp] source for lisp common lisp macros for backtracking

tstein@polyslo.CalPoly.EDU (Tomas Stein) (05/11/91)

I'm trying to find the source code for
the common lisp macros described in:

		LISP Macros for Backtracking
		H.J. Maxwell, M.S. Riggle
		AI EXPERT, March 89, pp. 28-39

I tried the AI Bulletin Board, as mentioned in the magazine.
However, I was unable to find this particular code. 
Any hints would be greatly appreciated.

Send replies to      tblandin@polyslo.CalPoly.EDU

Thanks.
Tomas Blandino.