Sherwood W. Wise, Jr., William W. Hay, Scanning Electron Microscopy of Molluscan Shell Ultrastructures I. Techniques for Polished and Etched Sections, Transactions of the American Microscopical Society, Vol. 87, No. 4 (Oct., 1968), pp. 411-418
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Wise et al. (1968) studied this question.
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