1. Fundamentals of Computer Algorithms;Horowitz,1978
2. Additive AND/OR graphs;Martelli;Proc. Third International Joint Conference on Artificial Intelligence,1973
3. Optimising decision trees through heuristically guided search;Martelli;Comm. ACM,1978
4. Problem Solving Methods in Artificial Intelligence;Nilsson,1971
5. Principles of Artificial Intelligence;Nilsson,1980