1. On machines which prove theorems;Beth;Simon Stevin (Wis- en Natuurkundig Tijdschrift),1958
2. The Unprovability of Consistency;Boolos,1979
3. Artificial Intelligence Programming;Charniak,1980
4. Causal and teleological reasoning in circuit recognition;de Kleer,1979
5. Explicit control of reasoning;de Kleer,1977