@ARTICLE\{IMM1989-0666,
    author       = "H. B. Nielsen",
    title        = "Methods for Analyzing Pipe Networks",
    year         = "1989",
    pages        = "139-157",
    journal      = "{ASCE} Journal Hydraulic Engineering",
    volume       = "115",
    editor       = "",
    number       = "2",
    publisher    = "Informatics and Mathematical Modelling, Technical University of Denmark, {DTU}",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/666-full.html"
}