@article{ESOP-J-1992-Jones94,
	author        = "Mark P. Jones",
	doi           = "10.1016/0167-6423(94)00005-0",
	journal       = "{Science of Computer Programming}",
	number        = 3,
	pages         = "231--256",
	title         = "{A Theory of Qualified Types}",
	volume        = 22,
	year          = 1994,
}