The following are in reverse chronological order of publication.
Nilsson, N. J., Rosen, C. A., Raphael, B., Forsen, G., Chaitin, L. and Wahlstrom, S. Application of Intelligent Automata to Reconnaissance, Technical Report . Stanford Research Institute, December 1968. [PDF, Details]
Nilsson, N. J., Raphael, B. and Wahlstrom, S. Application of Intelligent Automata to Reconnaissance, Technical Report . Stanford Research Institute, May 1968. [PDF, Details]