Guoqiang Bai 0002 Henning Fernau Constraint Bipartite Vertex Cover: Simpler Exact Algorithms and Implementations. 67-78 2008 FAW http://dx.doi.org/10.1007/978-3-540-69311-6_10 conf/faw/2008 db/conf/faw/faw2008.html#BaiF08