Yokota, T. (1951)
Studies on the stocks of sharks and rays. II. Age composition of the ray. Dasyatis akajei (Muller et Henle), as observed in the catch by trawlers landed at Totoro, Miyazaki prefecture during a period September, 1949 to May, 1950. Bulletin of the Japanese Society of Scientific Fisheries, 16(12), 188–189