@book { LogischeNotwendigkeitundgrammatischeRegeln,
    title = "Logische Notwendigkeit und grammatische Regeln",
    author = "Wei-cheng {Kung}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1089552"
}