On the Semantics of Logic Programs with Preferences.

Sergio Greco Irina Trubitsyna Ester Zumpano On the Semantics of Logic Programs with Preferences. 501-523 2007 30 J. Artif. Intell. Res. (JAIR) http://www.jair.org/papers/paper2371.html db/journals/jair/jair30.html#GrecoTZ07