@ARTICLE\{IMM2007-05530,
    author       = "F. Nielson and H. R. Nielson",
    title        = "Heuristice for Safety and Security Constraints",
    year         = "2007",
    month        = "jun",
    pages        = "523-543",
    journal      = "Journal",
    volume       = "172",
    editor       = "",
    number       = "",
    publisher    = "Elsevier North-Holland, Inc.",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/5530-full.html",
    isbn_issn    = "1571-0661"
}