@inproceedings{STOC-1975-EhrenfeuchtR75a,
	author        = "Andrzej Ehrenfeucht and Grzegorz Rozenberg",
	booktitle     = "{Proceedings of the Seventh Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800116.803762",
	pages         = "137--144",
	publisher     = "{ACM}",
	title         = "{On the (Combinatorial) Structure of L Languages without Interactions}",
	year          = 1975,
}