@CONFERENCE\{IMM2002-01634,
    author       = "F. Nielson and H. Riis Nielson and H. Seidl",
    title        = "Normalizable Horn Clauses, Strongly Recognizable  Relations and Spi",
    year         = "2002",
    pages        = "20-35",
    booktitle    = "Proc. {SAS'}02",
    volume       = "",
    series       = "Lecture Notes in Computer Science",
    editor       = "",
    publisher    = "Springer-Verlag",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1634-full.html"
}