@inproceedings{STOC-1991-Shapiro,
	author        = "Ehud Y. Shapiro",
	booktitle     = "{Proceedings of the 23rd Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/103418.103423",
	isbn          = "0-89791-397-3",
	pages         = "198--208",
	publisher     = "{ACM}",
	title         = "{Separating Concurrent Languages with Categories of Language Embeddings}",
	year          = 1991,
}