@CONFERENCE\{IMM1999-01628,
    author       = "F. Nielson and H. Riis Nielson and R. R. Hansen and J. G. Jensen",
    title        = "Validating Firewalls in Mobile Ambients",
    year         = "1999",
    pages        = "463-477",
    booktitle    = "Proc. {CONCUR'}99",
    volume       = "",
    series       = "Lecture Notes in Computer Science",
    editor       = "",
    publisher    = "Springer-Verlag",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1628-full.html"
}