@book { PlanungundControllingvonLoseblattwerken,
    title = "Planung und Controlling von Loseblattwerken",
    author = "Heinz-Josef {Wrobel}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832450984",
    url = "https://m.diplom.de/document/220627"
}