@ARTICLE\{IMM1989-03697,
    author       = "V. V. Vidal and O. G. Madsen",
    title        = "Booking control increases profit at {SAS}",
    year         = "1989",
    keywords     = "Booking, optimization, dynamic programming",
    pages        = "10-19",
    journal      = "Interfaces",
    volume       = "19",
    editor       = "",
    number       = "4",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3697-full.html"
}