Nikhil Bansal Niv Buchbinder Anupam Gupta Joseph Naor An <i>O</i> (log<sup>2</sup> <i>k</i> )-Competitive Algorithm for Metric Bipartite Matching. 522-533 2007 conf/esa/2007 ESA http://dx.doi.org/10.1007/978-3-540-75520-3_47 db/conf/esa/esa2007.html#BansalBGN07