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Kalmykova, M. A.; Alekseeva, I. A.; Polozova, A. N. (1972). New early Permian schwagerinids from the north of the russian plateau. Новые виды древних растений и беспозвоночных СССР - New species of ancient plants and invertebrates of the USSR. 19-25.
Kalmykova, M. A.; Alekseeva, I. A.; Polozova, A. N. (1972). New early Permian schwagerinids from the north of the russian plateau. Новые виды древних растений и беспозвоночных СССР - New species of ancient plants and invertebrates of the USSR. 19-25.