@ARTICLE\{IMM1988-03699,
    author       = "V. V. Vidal",
    title        = "Optimization of production planning models",
    year         = "1988",
    keywords     = "optimization, planning, linear models",
    pages        = "27-36",
    journal      = "Investigacion Operacional (Cuba)",
    volume       = "ix",
    editor       = "",
    number       = "3",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3699-full.html"
}