@book { FrdertechnikStetigfrderer,
    title = "Fördertechnik - Stetigförderer",
    author = "Katja {Sänger}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832409616",
    url = "https://m.diplom.de/document/216859"
}