@book { VeravonBissing,
    title = "Vera von Bissing",
    author = "Ernst {Probst}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640545711",
    url = "https://www.hausarbeiten.de/document/145506"
}