@book { DiePionierorganisationErnstThlmann,
    title = "Die Pionierorganisation «Ernst Thälmann»",
    author = "Beate {Kaiser}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03318-2",
    url = "https://www.peterlang.com/document/1047704"
}