@book { GrenzsituationundnukleareGefahr,
    title = "Grenzsituation und nukleare Gefahr",
    author = "Rainer {Kessler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1090682"
}