@inproceedings{NACLP-1989-Nystrom,
	author        = "Sven-Olof Nyström",
	booktitle     = "{Proceedings of the North American Conference on Logic Programming, 2 Volumes}",
	isbn          = "0-262-62064-2",
	pages         = "536--552",
	publisher     = "{MIT Press}",
	title         = "{Variable-Free Execution of Concurrent Logic Languages}",
	year          = 1989,
}