@TECHREPORT\{IMM2007-05275,
    author       = "P. Pinson and H. A. Nielsen and H. Madsen",
    title        = "Robust estimation of time-varying coefficient functions - Application to the modeling of wind power production",
    year         = "2007",
    number       = "",
    series       = "IMM-Technical Report-2007-09",
    institution  = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    address      = "Richard Petersens Plads, Building 321, {DK-}2800 Kgs. Lyngby",
    type         = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/5275-full.html"
}