@MISC\{IMM2009-05784,
    author       = "A. Dohn and E. Kolind",
    title        = "A Practical Branch and Price Approach to the Crew Scheduling Problem with Time Windows",
    year         = "2009",
    month        = "aug",
    publisher    = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/5784-full.html"
}