@BOOK\{IMM1995-0577,
    author       = "E. Balas and J. Clausen",
    title        = "Integer Programming and
Combinatorial Optimization",
    year         = "1995",
    volume       = "920",
    number       = "",
    series       = "LNCS",
    publisher    = "",
    address      = "",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/577-full.html"
}