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N. D.  Newell and Boyd, D. W., ?Oyster-like Permian Bivalvia?, Bulletin of the American Museum of Natural History, vol. 143, pp. 217-282, 1970.

S. W.  Wise, Jr, ?Microstructure and mode of formation of nacre (mother-of-pearl) in pelecypods, gastropods, and cephalopods?, Eclogae geologicae Helvetiae, vol. 63, pp. 775-797, 1970.