1. Anderson JR (1990) The adaptive character of thought: Studies in cognition. Lawrence Erlbaum, Mahwah
2. Anderson JR, Lebiere C (1998) The atomic components of thought. Lawrence Erlbaum, Mahwah
3. Arora S, Barak B (2009) Computational complexity: A modern approach (1st edn). Cambridge University Press, Cambridge
4. Ausiello G, Crescenzi P, Kann V, Gambosi G, Marchetti-Spaccamela A, Protasi M (2000) Complexity and approximation: Combinatorial optimization problems and their approximability properties. Springer, Berlin
5. Balkenius C, Gärdenfors P (1991) Nonmonotonic inference in neural networks. In: Allen JA, Fikes R, Sandewall E (eds) Proceedings of the second international conference on knowledge representation and reasoning. Morgan Kaufmann, San Mateo pp 32–39