@ARTICLE\{IMM1992-02758,
    author       = "J. Parkum and N. K. Poulsen and J. Holst",
    title        = "Recursive forgetting algorithms",
    year         = "1992",
    pages        = "109-128",
    journal      = "International Journal of Control",
    volume       = "55",
    editor       = "",
    number       = "1",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2758-full.html"
}