@inproceedings{LFP-1990-SheldonG,
	author        = "Mark A. Sheldon and David K. Gifford",
	booktitle     = "{Proceedings of the 1990 ACM Conference on LISP and Functional Programming}",
	doi           = "10.1145/91556.91577",
	isbn          = "0-89791-368-X",
	pages         = "20--29",
	publisher     = "{ACM Press}",
	title         = "{Static Dependent Types for First Class Modules}",
	year          = 1990,
}