@book { NachtrglicheSicherungsverwahrungverfassungsgem,
    title = "Nachträgliche Sicherungsverwahrung – verfassungsgemäß?",
    author = "Dagmar {Sprung}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106444"
}