1. Jacobs P., Rau L.: “Integrating Top Down and Bottom Up Strategies in a Text Processing System”, 2nd Conference on Applied Natural Language Processing, Austin, February 1988.
2. Hobbs J.R., Appelt D.E., Bear J., Tyson M.: “Robust Processing of Real-World Natural-Language Texts”, 3rd Conference on Applied Natural Language Processing, Trente, Italy, March 1992.
3. Ciravegna F., Campia P., Colognese A.: “Knowledge Extraction from Texts by SINTESI”, COLING 92, Nantes, July 1992.
4. Ciravegna F., Campia P., Colognese A.: “The Treatment of Conjunctions in an Information Retrieval System”, in F. Sorbello (ed.) “Le prospettive industriali dell'intelligenza Artificiale”, Palermo, October 91.
5. Renzi R., Salvi: “Grande Grammatica di Consultazione” vol I and II, “Il Mulino” editions, Bologna, 1988.