@book { DiegeheimnisvolleWeltderVampireundZwergmutze,
    title = "Die geheimnisvolle Welt der Vampire und Zwergmutze",
    author = "Werner {Gutjahr}",
    year = "2014",
    publisher = "TUBUK.digital",
    address = "München, Deutschland",
    url = "https://tubuk.openpublishing.com/document/284749"
}