@book { UntersuchungenzuKalanchoepinnata,
    title = "Untersuchungen zu Kalanchoe pinnata",
    author = "René {Glöckner}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836608763",
    url = "https://m.diplom.de/document/225527"
}