@book { TonkinExpedition,
    title = "Tonkin Expedition",
    author = "Kai {Althoetmar} and Michaele {Ijewski-Lamsfuhs}",
    year = "2022",
    publisher = "Nature Press",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1302347"
}