Y.  Matsui, ?Aspects of the environment of pearl-culture grounds and the problems of hybridization in the genus Pinctada?, in Perspectives in Marine Biology. Symposium held at Scripps institution of Oceanography, University of California, March 24-April 2, 1956, A. A.  Buzzati-Traverso, Ed. Berkeley & Los Angeles: University of California Press, 1958, pp. 519-531.

Y.  Matsui, ?Aspects of the environment of pearl-culture grounds and the problems of hybridization in the genus Pinctada?, in Perspectives in Marine Biology. Symposium held at Scripps institution of Oceanography, University of California, March 24-April 2, 1956, A. A.  Buzzati-Traverso, Ed. Berkeley & Los Angeles: University of California Press, 1958, pp. 519-531.