@book { GipfelstrmeVierRomane,
    title = "Gipfelstürme (Vier Romane)",
    author = "Alfred {Bekker} and Robert {Gruber}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Deutschland",
    url = "https://uksakebooks.grin.com/document/317001"
}