@ARTICLE\{IMM2001-0703,
    author       = "H. Riis Nielson and F. Nielson",
    title        = "Shape analysis for mobile ambients",
    year         = "2001",
    pages        = "233-275",
    journal      = "Nordic Journal of Computing",
    volume       = "8",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/703-full.html"
}