WordNet is a large lexical database of English, developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept.
H. Kozima, и T. Furugori. Proceedings of the sixth conference on European chapter of the Association for Computational Linguistics, стр. 232--239. Morristown, NJ, USA, Association for Computational Linguistics, (1993)