@CONFERENCE\{IMM1993-01878,
    author       = "Z. Chaochen and M. R. Hansen and P. Sestoft",
    title        = "Decidability and Undecidability Results for Duration Calculus",
    year         = "1993",
    pages        = "58-68",
    booktitle    = "STACS'93",
    volume       = "665",
    series       = "LNCS",
    editor       = "P. Enjalbert and A. Finkel and K. W. Wagner",
    publisher    = "Springer-Verlag",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1878-full.html"
}