@book { DieSpezielleRelativittstheorie,
    title = "Die Spezielle Relativitätstheorie",
    author = "Franz-Günter {Winkler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099802"
}