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Cheltsov, Yu.G. (1964). Yavleniye konvergentsii u akchagyl'skikh maktrid i kardiid [The phenomenon of convergence in Akchagylian maktrids and cardiids]. Paleontologicheskiy Zhurnal. 1964(4): 72-77.
Cheltsov, Yu.G. (1964). Yavleniye konvergentsii u akchagyl'skikh maktrid i kardiid [The phenomenon of convergence in Akchagylian maktrids and cardiids]. Paleontologicheskiy Zhurnal. 1964(4): 72-77.