@BOOK\{IMM1987-02261,
    author       = "D. Bj{\o}rner and C. Jones and M. M. Airchinnigh and E. J. Neuhold",
    title        = "{VDM} - A Formal Method at Work",
    year         = "1987",
    volume       = "",
    number       = "",
    series       = "Lecture Notes in Computer Science, Vol. 252",
    publisher    = "Springer",
    address      = "",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2261-full.html"
}