@article {DBLP:journals/amai/GiannottiGSZ97,
	title = {Programming with Non-Determinism in Deductive Databases},
	journal = {Ann. Math. Artif. Intell.},
	volume = {19},
	number = {1-2},
	year = {1997},
	pages = {97-125},
	author = {Fosca Giannotti and Sergio Greco and Domenico Sacc{\`a} and Carlo Zaniolo}
}
@conference {DBLP:conf/dood/GiannottiPSZ91,
	title = {Non-Determinism in Deductive Databases},
	booktitle = {DOOD},
	year = {1991},
	pages = {129-146},
	author = {Fosca Giannotti and Dino Pedreschi and Domenico Sacc{\`a} and Carlo Zaniolo}
}
