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@inproceedings{, author = {Matti Astrand and Patrik Floreen and Valentin Polishchuk and Joel Rybicki and Jukka Suomela and Jara Uitto}, title = {A Local 2-approximation Algorithm for the Vertex Cover Problem}, address = {Elche/Elx, Spain}, month = {Sep}, year = {2009} }