@inproceedings{PPDP-2001-GiavittoM,
	author        = "Jean-Louis Giavitto and Olivier Michel",
	booktitle     = "{Proceedings of the Third International Conference on Principles and Practice of Declarative Programming}",
	isbn          = "1-58113-388-X",
	pages         = "150--161",
	publisher     = "{ACM}",
	title         = "{Declarative Definition of Group Indexed Data Structures and Approximation of Their Domains}",
	year          = 2001,
}