The following are in reverse chronological order of publication.
Bell, James Richard. Design of a Minimal Expandable Computer Language, Technical Note 1. AI Center, SRI International, 333 Ravenswood Ave, Menlo Park, CA 94025, Dec 1968. [PDF, Details]
Rosen, C. A. and Nilsson, N. J. Application of Intelligent Automata to Reconnaissance, Technical Report . Stanford Research Institute, March 1967. [PDF, Details]