Ayala, F. J.; Valentine, J. W.; Delaca, T. E.; Zumwalt, G. S. (1975). Genetic variability of the Antarctic brachiopod Liothyrella notorcadensis and its bearing on mass extinction hypotheses. Journal of Paleontology. 1-9.
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Ayala, F. J.; Valentine, J. W.; Delaca, T. E.; Zumwalt, G. S.
1975
Genetic variability of the Antarctic brachiopod Liothyrella notorcadensis and its bearing on mass extinction hypotheses