@article{journals/ipl/DalalE92,
	title = {A Hierarchy of Tractable Satisfiability Problems.},
	author = {Mukesh Dalal and David W. Etherington},
	journal = {Inf. Process. Lett.},
	number = {4},
	pages = {173-180},
	url = {http://dblp.uni-trier.de/db/journals/ipl/ipl44.html#DalalE92},
	volume = {44},
	year = {1992},
	biburl = {http://www.bibsonomy.org/bibtex/2505c70461df68260cf66d3f553ae86d5/dblp},
	description = {dblp},
	date = {2003-11-20},
	keywords = {dblp }
}