@book { GrndungsverhaltenvonBestAgern,
    title = "Gründungsverhalten von Best Agern",
    author = "Matthias {Puls}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836625661",
    url = "https://m.diplom.de/document/226531"
}