@conference{biso00,
author = "Alessandro Biso and Francesca Rossi and Alessandro Sperduti",
address = "San Francisco",
booktitle = "KR2000: Principles of Knowledge Representation and
                   Reasoning",
editor = "Anthony G. Cohn and Fausto Giunchiglia and Bart Selman",
pages = "435--444",
publisher = "Morgan Kaufmann",
title = "{E}xperimental {R}esults on {L}earning {S}oft {C}onstraints",
year = "2000",
}