@ARTICLE\{IMM1995-0580, author = "J. Clausen and J. Krarup", title = "A Family of Bipartite Cardinality Matching Problems Solvable in O(n\^2) Time", year = "1995", pages = "496 - 501", journal = "Nordic Journal of Computing", volume = "2", editor = "", number = "", publisher = "", url = "http://www2.compute.dtu.dk/pubdb/pubs/580-full.html" }