@book { InvasionGegenschlag,
    title = "Invasion & Gegenschlag",
    subtitle = "Zwei Thriller in einem eBook",
    author = "Eric L. {Harry} and Bernhard {Liesen} and Heiner {Friedrich}",
    year = "2023",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/1414946"
}