Nagao, T.; Ôtatume, K. (1943). The Fossil Corbiculids from the Palaeogene Isikari Series in the Isikari Coal-Field, Hokkaidô. Journal of the Faculty of Science, Hokkaido Imperial University. Ser. 4, Geology and mineralogy. 7(1): 1-13.
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Nagao, T.; Ôtatume, K.
1943
The Fossil Corbiculids from the Palaeogene Isikari Series in the Isikari Coal-Field, Hokkaidô
Journal of the Faculty of Science, Hokkaido Imperial University. Ser. 4, Geology and mineralogy