M. Hermann, R. Pichler:
"Counting Complexity of Propositional Abduction";
Talk: International Joint Conference on Artificial Intelligence (IJCAI), Hyderabad, Indien; 2007-01-06 - 2007-01-12; in: "Proceeding of the Twentieth International Joint Conference on Artificial Intelligence", AAAI Press, Volume 1, 2 (2007), ISBN: 978-1-57735-298-3; 417 - 422.