@book { DieGlobalisierungderTelekommunikationim19Jahrhundert,
    title = "Die Globalisierung der Telekommunikation im 19. Jahrhundert",
    author = "Michael {Wobring}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099453"
}