Kang, M. G., 1973, O novykh vidakh roda Dagmarella i vostochnoy chasti Ugol'nogo mestorozhdeniya Pionnam i ikh klassifikatsiya (zona Profusulinella) (in Korean) [New species of the genus Dagmarella from the eastern part of the Pnom coal deposits and their classification (Profusulinella Zone)], Choson Minchuchui Inmin Konkhvaguk K vakhakvon Tkhonbo 1973(4):21-25.
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Kang, M. G., 1973, O novykh vidakh roda Dagmarella i vostochnoy chasti Ugol'nogo mestorozhdeniya Pionnam i ikh klassifikatsiya (zona Profusulinella) (in Korean) [New species of the genus Dagmarella from the eastern part of the Pnom coal deposits and their classification (Profusulinella Zone)], Choson Minchuchui Inmin Konkhvaguk K vakhakvon Tkhonbo 1973(4):21-25.