@MISC\{IMM1989-03829,
    author       = "V. V. Vidal",
    title        = "Lagrange multiplicatorer - en introduktion",
    year         = "1989",
    pages        = "18",
    publisher    = "{IMSOR,} {DTH}",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3829-full.html"
}