@book { TinnitusundStress,
    title = "Tinnitus und Stress",
    author = "Mario {Piskernig}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832461539",
    url = "https://m.diplom.de/document/221610"
}