@book { JohannesTrojan18371915,
    title = "Johannes Trojan 1837–1915",
    subtitle = "Ein Spötter und Poet zwischen Kanzler und Kaiser",
    author = "Friedrich {Mülder}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096202"
}