@TECHREPORT\{IMM1992-02740,
    author       = "J. Carstensen and H. Madsen and N. K. Poulsen",
    title        = "Identification of wastewater processes using nonlinear grey box models",
    year         = "1992",
    number       = "6",
    series       = "",
    institution  = "Institute of Mathematical Statistics and Operations Research (IMSOR), The Technical University of Denmark",
    address      = "",
    type         = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2740-full.html"
}