Scientific Publications
| Bulletin of the National Science Museum Series C (Geology & Paleontology) | date of publication | |
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| Bulletin of the National Science Museum Series C (Geology & Paleontology) Volume 5 Number 2 | June 1979 | |
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| Keisaku Tanaka, Yasumitsu Kanie, Ikuwo Obata: | P.25 | |
| Maastrichtian and Danian Echinoids from Northwestern Madagascar |  |
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| Ikuwo Obata, Kazushite Tanabe, Masao Futakami: | P.51 | |
| Ontogeny and Variation in Subprionocyclus neptuni, an Upper Cretaceous Collignoniceratid Ammonite | |
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