@CONFERENCE\{IMM1993-02773,
    author       = "M. Rostgaard and N. K. Poulsen and O. Ravn",
    title        = "A rapprochement Between Discrete-time operators",
    year         = "1993",
    pages        = "426-431",
    booktitle    = "European Control Conference (ECC93), Groningen, The Netherlands",
    volume       = "2",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    note         = "Also technical report no. 15/92, {IMSOR,} {DTU}",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2773-full.html"
}