@article{Ladkin92Effective,
	title = {Effective Solution of Qualitative Interval Constraint Problems.},
	author = {Peter B. Ladkin and Alexander Reinefeld},
	journal = {Artif. Intell.},
	number = {1},
	pages = {105-124},
	url = {http://dblp.uni-trier.de/db/journals/ai/ai57.html#LadkinR92},
	volume = {57},
	year = {1992},
	biburl = {http://www.bibsonomy.org/bibtex/2660f7f1df5f87dcccbbef61f5ab213fc/zeno},
	description = {dblp},
	date = {2003-11-19},
	keywords = {1992 interval-algebra qualitative-reasoning }
}