@book { MethodenundInstrumentedesSupplyChainMapping,
    title = "Methoden und Instrumente des Supply Chain Mapping",
    author = "Jan-Marcus {Rüger}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832440695",
    url = "https://m.diplom.de/document/219698"
}