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Pozner, V. M.; Shlykova, T. I. (1961). К палеонтологической характеристике раковских слоев нижнего карбона Среднего Поволжья - To the paleontological characterization of the Rakovsky layers of the Lower Carboniferous of the Middle Volga Region. Микрофаупа СССР Сборник 13, Тр. ВНИГРИ - Microfauna of the USSR vol. 13, Transactions of All-Union Geological Mining Institute. 179: 5-21.