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Ichimura, S., Kobayasi, H. & Kato, K. (1965). Studies on the phytoplankton and primary production of Lake Hachiro-gata. Lake Hachiro-gata Comprehensive Academic Research Group (ed.) Research on Lake Hachiro-gata. Akita Prefectural Board of Education, Akita. 1010 pp. pp. 418–463.