@book { PterisrmanisundJnisJaunsudrabi,
    title = "Pēteris Ērmanis und Jānis Jaunsudrabiņš",
    author = "Liene {Lauska}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135669"
}