@book { FreibergerSeminarezumGewerblichenRechtsschutz,
    title = "Freiberger Seminare zum Gewerblichen Rechtsschutz",
    author = "Gerhard {Ring}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105612"
}