@BOOK\{IMM1980-02257,
    author       = "D. Bj{\o}rner",
    title        = "Abstract Software Specifications",
    year         = "1980",
    volume       = "86",
    number       = "",
    series       = "LNCS",
    publisher    = "S",
    address      = "",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2257-full.html"
}