@book { DreiTchterihrerMutter,
    title = "Drei Töchter ihrer Mutter",
    subtitle = "Erotischer Roman",
    author = "Pierre  {Louÿs}",
    year = "2015",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/311449"
}