@book { EinSommeraufHiddensee,
    title = "Ein Sommer auf Hiddensee",
    author = "Horst-Dieter {Radke} and Monika {Detering}",
    year = "2021",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/997077"
}