@CONFERENCE\{IMM1991-02757,
    author       = "J. Parkum and N. K. Poulsen and J. Holst",
    title        = "Analysis of Forgetting Methods",
    year         = "1991",
    pages        = "134-189",
    booktitle    = "The 9th {IFAC}/{IFORS} Symposium on Identification and System Parameter Estimation, Budapest, Hungary",
    volume       = "1",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2757-full.html"
}