W. Faber, H. Tompits, S. Woltran:
"Characterizing Notions of Strong Equivalence for Logic Programs with Ordered Disjunctions";
Talk: VLDB 2007, Wien; 2007-09-23 - 2007-09-24; in: "3rd Multidisciplinary Workshop on Advances in Preference Handling (M-PREF 2007)", (2007), 8 pages.