@inproceedings{POPL-1973-NolinR,
	author        = "Louis Nolin and G. Ruggiu",
	booktitle     = "{Conference Record of the First Symposium on Principles of Programming Languages}",
	doi           = "10.1145/512927.512937",
	editor        = "Patrick C. Fischer and Jeffrey D. Ullman",
	pages         = "108--119",
	publisher     = "{ACM Press}",
	title         = "{Formalization of Exel}",
	year          = 1973,
}