@CONFERENCE\{IMM1980-03800,
    author       = "V. V. Vidal and J. Lyngvig",
    title        = "Planning theories",
    year         = "1980",
    pages        = "30",
    booktitle    = "NOAS'80, Island",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3800-full.html"
}