@BOOK\{IMM2010-05938,
    author       = "H. B. Nielsen and K. Madsen",
    title        = "Introduction to Optimization and Data Fitting",
    year         = "2010",
    month        = "aug",
    pages        = "176",
    volume       = "",
    number       = "",
    series       = "",
    publisher    = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    address      = "Richard Petersens Plads, Building 321, {DK-}2800 Kgs. Lyngby",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/5938-full.html"
}