@inproceedings{ICEIS-2002-NovaisBN,
	author        = "Paulo Novais and Luís Brito and José Neves",
	booktitle     = "{Proceedings of the Fourth International Conference on Enterprise Information Systems}",
	pages         = "1103--1106",
	title         = "{The Concepts of Gratitude, Delegation and Agreement in Ecenvironments}",
	year          = 2002,
}