@book { ProjektcontrollingmitNetzplantechnik,
    title = "Projektcontrolling mit Netzplantechnik",
    author = "Rene {Leutert}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836602419",
    url = "https://m.diplom.de/document/228817"
}