@inproceedings{PPDP-1999-AnconaZ,
	author        = "Davide Ancona and Elena Zucca",
	booktitle     = "{Proceedings of the First International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1007/10704567_4",
	isbn          = "3-540-66540-4",
	pages         = "62--79",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{A Primitive Calculus for Module Systems}",
	volume        = 1702,
	year          = 1999,
}