1. Agosti, M., Colotti, R. and Gradenigo, G. (1991). A Two-Level Hypertext Retrieval Model for Legal Data. In: A. Bookstein, Y. Chiaramella, G. Saltón and V.V. Raghavan (Eds.), Proc. 14th ACM-SIGIR Conference, Chicago (USA), 316–325.
2. Amann, B. and Scholl, M. (1992). GRAM: A Graph Model and Query Language. In: D. Lucarella, J. Nanard, M. Nanard and P. Paolini (Eds.), Proc. ECHT ’92, Milan (Italy), 201–211.
3. Allen, J. and Salton, G. (1993). The Identification of Text Relations Using Automatic Hypertext Linking. Workshop on Intelligent Hypertext, CIKM’93.
4. Berrut, C. (1990). Indexing Medical Reports: The RIME Approach. Information Processing & Management, 26(1), 93–109.
5. Chevallet, J.P (1992). Un Model Logique de Recherche d’Informations appliqué au formalisme des Graphes Conceptuels, le Prototype ELEN et son Expérimentation sur un Corpus de Composants Logicels. Thése de l’Université J. Fourier, Grenoble, 15 mai 1992.