@book { DieDemonstrativpronominaimRigveda,
    title = "Die Demonstrativpronomina im Rigveda",
    author = "Katharina {Kupfer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093133"
}