@book { DerVManneinsatzdurchPolizeiundVerfassungsschutz,
    title = "Der V-Manneinsatz durch Polizei und Verfassungsschutz",
    author = "Anna Luise {Decker}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14647",
    url = "https://www.peterlang.com/document/1057428"
}