@InCollection{Straccia99, author = "Straccia, Umberto", title = "A Framework for the Retrieval of Multimedia Objects Based on Four-Valued Fuzzy Description Logics", booktitle = "Soft Computing in Information Retrieval: Techniques and Applications", publisher = "Physica Verlag (Springer Verlag)", year = 1999, editor = "Crestani, F. and Pasi, Gabriella", address = "Heidelberg, Germany" }