@article{ICLP-J-2013-MazuranSZ,
	author        = "Mirjana Mazuran and Edoardo Serra and Carlo Zaniolo",
	doi           = "10.1017/S1471068413000380",
	journal       = "{Theory and Practice of Logic Programming}",
	number        = "4-5",
	pages         = "609--623",
	title         = "{A declarative extension of horn clauses, and its significance for datalog and its applications}",
	volume        = 13,
	year          = 2013,
}