@ARTICLE\{IMM2007-04492,
    author       = "V. V. Vidal",
    title        = "The art and science of problem solving",
    year         = "2007",
    pages        = "157-178",
    journal      = "Investigacao Operacional",
    volume       = "25",
    editor       = "",
    number       = "",
    publisher    = "Association Portuguesse of Operational Reserach",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4492-full.html"
}