@book { GuntherIpseninLeipzig,
    title = "Gunther Ipsen in Leipzig",
    subtitle = "Die wissenschaftliche Biographie eines «Deutschen Soziologen» 1919-1933",
    author = "David {Hamann}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02401-2",
    url = "https://www.peterlang.com/document/1046329"
}