@ARTICLE\{IMM2006-04737,
    author       = "I. L. G{\o}rtz and A. Wirth",
    title        = "Asymmetry in k-Center Variants",
    year         = "2006",
    month        = "aug",
    keywords     = "Approximation",
    pages        = "188-199",
    journal      = "Theoretical Computer Science",
    volume       = "361",
    editor       = "",
    number       = "2-3",
    publisher    = "Elsevier",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4737-full.html",
    isbn_issn    = "{ISSN} 0304-3975"
}