Production Systems

1. Post, Emil (1943), "Formal Reductions of the General Combinatorial Decision Problem", American Journal of Mathematics 65(2; Apr.): 197-215.

2. Sample Production System

3. GPS & SOAR

4. Gries, David (1981), excerpt from The Science of Programming (New York: Springer-Verlag), Ch. 10, pp. 131-135.
   • On the "guarded if" command