@book { KrankheitenderHeimtiere,
    title = "Krankheiten der Heimtiere",
    author = "Michael {Fehr} and Peernel {Zwart} and Karl {Gabrisch} and Lutz {Sassenburg}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403528"
}