@CONFERENCE\{IMM2000-0939,
    author       = "J. Villadsen",
    title        = "Logic based on Semiotics",
    year         = "2000",
    pages        = "39-40",
    booktitle    = "Congress of the Nordic Association for Semiotic Studies",
    volume       = "",
    series       = "",
    editor       = "F. Stjernfelt et al.",
    publisher    = "University of Copenhagen",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/939-full.html"
}