@TECHREPORT\{IMM2002-0665,
    author       = "K. Madsen and H. B. Nielsen and J. S{\o}ndergaard",
    title        = "Robust Subroutines for Non-Linear Optimization",
    year         = "2002",
    pages        = "34",
    number       = "",
    series       = "IMM-TR-2002-12",
    institution  = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    address      = "Richard Petersens Plads, Building 321, {DK-}2800 Kgs. Lyngby",
    type         = "",
    url          = "http://www.imm.dtu.dk/~km/F-package/robust.pdf"
}