1. Belnap, N.: A useful four-valued logic. In: Modern Uses of Multiple-Valued Logic, pp. 8–37. Reidel, Dordrecht (1977)
2. Budanitsky, A., Hirst, G.: Semantic distance in wordnet: An experimental, application-oriented evaluation of five measures. In: Workshop on WordNet, Pittsburgh, PA. (2001)
3. Chopra, S., Parikh, R., Wassermann, R.: Approximate belief revision- prelimininary report. Journal of IGPL (2000)
4. Cilibrasi, R., Vitany, P.: The Google similarity distance. IEEE/ACM Transactions on Knowledge and Data Engineering 19(3), 370–383 (2007)
5. Cilibrasi, R., Vitanyi, P.: Automatic meaning discovery using Google. Technical report, Centre for Mathematics and Computer Science, CWI (2004)