Samir Datta Raghav Kulkarni Sambuddha Roy Deterministically Isolating a Perfect Matching in Bipartite Planar Graphs. 2008 STACS 229-240 http://drops.dagstuhl.de/opus/volltexte/2008/1346 conf/stacs/2008 db/conf/stacs/stacs2008.html#DattaKR08