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Balashov, Z. G. (1960). Novye ordovikskie nautiloidei SSSR [New Ordovician nautiloids of the USSR]. Novye Vidy Drevnikh Rastennyi i Besposvonochnykh SSSR. 2: 123-137 [in Russian].
Balashov, Z. G. (1960). Novye ordovikskie nautiloidei SSSR [New Ordovician nautiloids of the USSR]. Novye Vidy Drevnikh Rastennyi i Besposvonochnykh SSSR. 2: 123-137 [in Russian].
