@book { OphthalmologyfortheVeterinaryPractitioner,
    title = "Ophthalmology for the Veterinary Practitioner",
    author = "Frans C. {Stades} and Milton {Wyman} and Michael {Boevé} and Willy {Neumann} and Dr. Bernhard M. {Spiess}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403609"
}