@CONFERENCE\{IMM1979-0334,
    author       = "H. Juel",
    title        = "A sufficient optimality condition for the multifacility location problem with an arbitrary norm",
    year         = "1979",
    month        = "feb",
    pages        = "288-289",
    booktitle    = "American Institute for Decision Sciences, Southeast Section, 9th Annual Meeting",
    volume       = "",
    series       = "",
    editor       = "Alan H. Kvanli and Joseph G. Van Matre",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/334-full.html"
}