@inproceedings{KR-1992-Backstrom,
	author        = "Christer Bäckström",
	booktitle     = "{Proceedings of the Third International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-262-3",
	pages         = "126--137",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Equivalence and Tractability Results for SAS+ Planning}",
	year          = 1992,
}