Andreas Wiese Evangelos Kranakis Local Maximal Matching and Local 2-Approximation for Vertex Cover in UDGs. 1-14 2008 ADHOC-NOW http://dx.doi.org/10.1007/978-3-540-85209-4_1 conf/adhoc-now/2008 db/conf/adhoc-now/adhoc-now2008.html#WieseK08