@book { GabeseinenStalinHitlerPakt,
    title = "Gab es einen Stalin-Hitler-Pakt?",
    author = "Christoph {Koch}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-05572-6",
    url = "https://www.peterlang.com/document/1049448"
}