@ARTICLE\{IMM1991-03709,
    author       = "V. V. Vidal and M. Thorsen",
    title        = "{OR} in the Danish steel industry",
    year         = "1991",
    keywords     = "planning, optimization, heuristics",
    pages        = "301-309",
    journal      = "European Journal of Operational Research",
    volume       = "51",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3709-full.html"
}