@book { HermannHeller,
    title = "Hermann Heller",
    subtitle = "Historismus und Geschichtswissenschaft im Staatsrecht (1919-1933)",
    author = "Peter {Goller}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093507"
}