K.  Wada, ?Laminary structures of cultured pearls observed with electron microscope - I. Nacreous layer pearl?, Bulletin of the Japanese Society of Scientific Fisheries, vol. 23, pp. 302-305, 1957.

K.  Wada, ?Laminary structures of cultured pearls observed with electron microscope - I. Nacreous layer pearl?, Bulletin of the Japanese Society of Scientific Fisheries, vol. 23, pp. 302-305, 1957.