@article{ICLP-J-2015-AlvianoL,
	author        = "Mario Alviano and Nicola Leone",
	doi           = "10.1017/S147106841500023X",
	journal       = "{Theory and Practice of Logic Programming}",
	number        = "4-5",
	pages         = "574--587",
	title         = "{Complexity and compilation of GZ-aggregates in answer set programming}",
	volume        = 15,
	year          = 2015,
}