@ARTICLE\{IMM1986-03687,
    author       = "V. V. Vidal and O. G. Madsen",
    title        = "Booking policy for flights with two pasenger types",
    year         = "1986",
    pages        = "274-288",
    journal      = "European Journal of Operational Research",
    volume       = "27",
    editor       = "",
    number       = "3",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3687-full.html"
}