M. Hearne, S. Ozdowska, и J. Tinsley. Actes de la 15e Conférence Annuelle sur le Traitement Automatique des Langues Naturelles (TALN '08), Avignon, France, ATALA, (2008)
R. Hwa, P. Resnik, A. Weinberg, и O. Kolak. ACL '02: Proceedings of the 40th Annual Meeting on Association for Computational Linguistics, стр. 392--399. Morristown, NJ, USA, Association for Computational Linguistics, (2001)