@inproceedings{LICS-1987-BohmT,
	author        = "Corrado Böhm and Enrico Tronci",
	booktitle     = "{Proceedings of the Second Symposium on Logic in Computer Science}",
	pages         = "320--328",
	publisher     = "{IEEE Computer Society}",
	title         = "{X-Separability and Left-Invertibility in λ-calculus}",
	year          = 1987,
}