@book { WaskommtnachLeanProduction,
    title = "Was kommt nach Lean-Production?",
    author = "Thomas {Focke}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832437121",
    url = "https://m.diplom.de/document/219397"
}