@book { TSCHEPPLuntermREGENBOGEN,
    title = "TSCHEPPL unterm REGENBOGEN",
    author = "Ulrich Michael {Heissig}",
    year = "2020",
    publisher = "Omnino Verlag",
    address = "Berlin, Deutschland",
    url = "https://shop.omnino-verlag.de/document/902497"
}