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Oleneva, N. V. (2006). Systematics and shell microstructure of the spiriferid genera Echinospirifer and Komispirifer from the Upper Devonian of southern Timan. Paleontological Journal. 40(1): 55-65.
Oleneva, N. V. (2006). Systematics and shell microstructure of the spiriferid genera Echinospirifer and Komispirifer from the Upper Devonian of southern Timan. Paleontological Journal. 40(1): 55-65.
