@book { Valamims,
    title = "Valami más",
    author = "Eckhard {Höfner} and Hartmut {Schröder} and Roland {Wittmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093709"
}