@inproceedings{POPL-1975-Ligler,
	author        = "George T. Ligler",
	booktitle     = "{Conference Record of the Second Symposium on Principles of Programming Languages}",
	doi           = "10.1145/512976.512982",
	editor        = "Robert M. Graham and Michael A. Harrison and John C. Reynolds",
	pages         = "41--53",
	publisher     = "{ACM Press}",
	title         = "{A Mathematical Approach to Language Design}",
	year          = 1975,
}