1. http://www.merriam-webster.com/dictionary/paradox
2. Oxford Advanced Learner’s Dictionary.
http://www.oxforddictionaries.com/definition/english/paradox
3. Russell, S.J., Norvig, P.: Artificial Intelligence: A Modern Approach, 2nd edn. Prentice Hall, Upper Saddle River (2003)
4. Samsonovich, A.V., Ascoli, G.A., De Jong, K.A.: Human-level psychometrics for cognitive architectures. In: Smith, L., Sporns, O., Yu, C., Gasser, M., Breazeal, C., Deak, G., Weng, J. (eds.) Proceedings of the Fifth International Conference on Development and Learning (2006)
5. Vityaev, E.E., Perlovsky, L.I., Kovalerchuk, B.Y., Speransky, S.J.: Probabilistic dynamic logic of cognition. Biol. Inspired Cogn. Archit. 6, 159–168 (2013). (Special issue: papers from Fourth Annual Meeting of the BICA Society)