@MISC\{IMM1974-03794,
    author       = "V. V. Vidal",
    title        = "Principles of {OR}",
    year         = "1974",
    pages        = "43",
    publisher    = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3794-full.html"
}