@inproceedings{PPDP-2008-SilvaO,
	author        = "Paulo F. Silva and José Nuno Oliveira",
	booktitle     = "{Proceedings of the 10th International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/1389449.1389456",
	isbn          = "978-1-60558-117-0",
	pages         = "44--55",
	publisher     = "{ACM}",
	title         = "{“Galculator”: functional prototype of a Galois-connection based proof assistant}",
	year          = 2008,
}