A study on the biology of rays occurring at Pohnpei Island, Caroline Islands. Proceedings of the 4th Indo-Pacific Fish Conference, Bankok: 87–107
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Redescription, distribution and food habits of the Indo-Pacific dasyatidid stingray Himantura granulata. Japanese Journal of Ichthyology, 40(1), 23–28
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Survey of rays in the Pohnpei Island, Federated States of Micronesia [in Japanese], Report of Japanese Society for Elasmobranch Studies, 28, 1–16