@CONFERENCE\{IMM2002-0347,
    author       = "H. Juel",
    title        = "Properties of {3-}dimensional line location models",
    year         = "2002",
    month        = "jun",
    booktitle    = "9th International Symposium on Locational Decisions",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/347-full.html"
}