@book { FreibergerSymposiumzumGewerblichenRechtsschutz,
    title = "Freiberger Symposium zum Gewerblichen Rechtsschutz",
    author = "Gerhard {Ring}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099089"
}