@book { WarumundwieermordetedieGPULeoTrotzki, title = "Warum und wie ermordete die GPU Leo Trotzki?", subtitle = "gleichheit 1/2016", author = "Peter {Schwarz}", year = "2016", publisher = "MEHRING Verlag", address = "Essen, Deutschland", url = "https://mehring.openpublishing.com/document/324360" }