@inproceedings{PPDP-2002-BlancE,
	author        = "Jérémie Blanc and Rachid Echahed",
	booktitle     = "{Proceedings of the Fourth International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/571157.571172",
	pages         = "145--155",
	publisher     = "{ACM}",
	title         = "{A generic operator over discrete time intervals}",
	year          = 2002,
}