@inproceedings{STOC-1979-Ladner,
	author        = "Richard E. Ladner",
	booktitle     = "{Proceedings of the 11th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800135.804415",
	pages         = "214--223",
	publisher     = "{ACM}",
	title         = "{The Complexity of Problems in Systems of Communicating Sequential Processes}",
	year          = 1979,
}