@MISC\{IMM1993-02771,
    author       = "N. K. Poulsen and M. Rostgaard and B. G. Thygesen and O. Ravn",
    title        = "Prediction Error Methods for Delta Models",
    year         = "1993",
    publisher    = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2771-full.html"
}