@book { MehrwegTransportverpackungen,
    title = "Mehrweg-Transportverpackungen",
    author = "Ralf {Ullrich}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832439828",
    url = "https://m.diplom.de/document/219619"
}