@book { AntwortenaufdeninternationalenTerrorismus,
    title = "Antworten auf den internationalen Terrorismus",
    author = "Joachim {Mertes} and Gerhard {Robbers}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103775"
}