@inproceedings{ILPS-1997-LeachNR,
	author        = "Javier Leach and Susana Nieva and Mario Rodríguez-Artalejo",
	booktitle     = "{Proceedings of the International Symposium on Logic Programming}",
	isbn          = "0-262-63180-6",
	pages         = "307--321",
	publisher     = "{MIT Press}",
	title         = "{Constraint Logic Programming with Hereditary Harrop Formulas}",
	year          = 1997,
}