@ARTICLE\{IMM1991-0700,
    author       = "C. T. Hansen and K. Madsen and H. B. Nielsen",
    title        = "Optimization of Pipe Networks",
    year         = "1991",
    pages        = "45-58",
    journal      = "Mathematical Programming",
    volume       = "52",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/700-full.html"
}