@CONFERENCE\{IMM1987-0352,
    author       = "H. Juel",
    title        = "A localization property for facility location problems with arbitrary norms",
    year         = "1987",
    booktitle    = "4th International Symposium on Locational Decisions",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/352-full.html"
}