@ARTICLE\{IMM2005-04138,
    author       = "D. Bj{\o}rner",
    title        = "Multimodal Transportation Nets",
    year         = "2005",
    keywords     = "Research Report",
    pages        = "30",
    journal      = "British Computer Society {FACS} {FACT}",
    volume       = "",
    editor       = "Paul Boca",
    number       = "4",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4138-full.html"
}