Template:Endo, 1951
- Endo, R. 1951. Stratigraphical and Paleontological studies of the Later Paleozoic Calcareous Algae in Japan, I. Several new species from the Sakamotozawa section, Hikoroichi-mura, Kesen-gun, in the Kitakami Mountainous Land. Transactions and proceedings of the Palaeontological Society of Japan 1951(4): 121–129.