@BOOK\{IMM2004-02867,
    author       = "C. Zhou and M. R. Hansen",
    title        = "Duration Calculus: A Formal Approach to Real-Time Systems",
    year         = "2004",
    pages        = "257",
    volume       = "",
    number       = "",
    series       = "EATCS: Monographs in Theoretical Computer Science",
    publisher    = "Springer",
    address      = "",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2867-full.html"
}