@CONFERENCE\{IMM1998-01904,
    author       = "H. Sun and M. R. Hansen",
    title        = "Events in Duration Calculus",
    year         = "1998",
    pages        = "133-140",
    booktitle    = "Proc. of the 10th European Summer School in Logic Language and Information (ESSLLI'98) Workshop on Duration Calculus",
    volume       = "",
    series       = "",
    editor       = "Michael R. Hansen",
    publisher    = "{DFKI} Saarbrücken",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1904-full.html"
}