@CONFERENCE\{IMM1979-0359,
    author       = "H. Juel",
    title        = "Some sufficient optimality criteria for solving multi-facility location problems with arbitrary norms",
    year         = "1979",
    booktitle    = "The Institute of Management Sciences - Operations Research Society of America",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/359-full.html"
}