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Zakharov, Y. D.; Popov, A. M.; Biakov, A. S. (2008). Late Permian to Middle Triassic palaeogeographic differentiation of key ammonoid groups: evidence from the former USSR. Polar Research. 27(3): 441-468.
Zakharov, Y. D.; Popov, A. M.; Biakov, A. S. (2008). Late Permian to Middle Triassic palaeogeographic differentiation of key ammonoid groups: evidence from the former USSR. Polar Research. 27(3): 441-468.
