@TECHREPORT\{IMM1991-0669,
    author       = "H. B. Nielsen",
    title        = "{SPLPAK} - Pascal and Fortran77 Subprograms for Cubic Splines",
    year         = "1991",
    pages        = "28",
    number       = "",
    series       = "",
    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/669-full.html",
    isbn_issn    = "Report {NI} 91-06"
}