@inproceedings{SIGAda-2009-Knight,
	author        = "John Knight",
	booktitle     = "{Proceedings of the Annual ACM SIGAda International Conference on Ada}",
	doi           = "10.1145/1647420.1647440",
	isbn          = "978-1-60558-475-1",
	pages         = "85--86",
	publisher     = "{ACM}",
	title         = "{Echo: a new approach to formal verification based on Ada}",
	year          = 2009,
}