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Plotnikov, M. A. (1949). K poznaniyu fauny tatarskogo yarusa rr. Sukhony i Maloy Severnoy Dviny [To the knowledge of the fauna from the Tatarian Stage of the Sukhona and Malaya Severnaya Dvina rivers]. Yezhegodnik Vsesoyuznogo Paleontologicheskogo Obshchestva. 13: 91-96, pl. 10.
Plotnikov, M. A. (1949). K poznaniyu fauny tatarskogo yarusa rr. Sukhony i Maloy Severnoy Dviny [To the knowledge of the fauna from the Tatarian Stage of the Sukhona and Malaya Severnaya Dvina rivers]. Yezhegodnik Vsesoyuznogo Paleontologicheskogo Obshchestva. 13: 91-96, pl. 10.