@conference {DBLP:conf/fqas/GiannottiMNP98,
	title = {Query Answering in Nondeterministic, Nonmonotonic Logic Databases},
	booktitle = {FQAS},
	year = {1998},
	pages = {175-187},
	author = {Fosca Giannotti and Giuseppe Manco and Mirco Nanni and Dino Pedreschi}
}
