@book { OttoBauer,
    title = "Otto Bauer",
    subtitle = "Studien zur sozial-politischen Philosophie",
    author = "Ewa {Czerwinska-Schupp}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099042"
}