@inproceedings{PPDP-2003-NielsenK,
	author        = "Mogens Nielsen and Karl Krukow",
	booktitle     = "{Proceedings of the Fifth International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/888251.888253",
	isbn          = "1-58113-705-2",
	pages         = "4--7",
	publisher     = "{ACM}",
	title         = "{Towards a formal notion of trust}",
	year          = 2003,
}