Okumura, Hiroshi Japanese mathematics. (English) Zbl 1202.01025 Symmetry Cult. Sci. 12, No. 1-2, 79-86 (2001). MSC: 01A27 PDFBibTeX XMLCite \textit{H. Okumura}, Symmetry Cult. Sci. 12, No. 1--2, 79--86 (2001; Zbl 1202.01025)
Okumura, Hiroshi Geometries in the East and West in the 19th century. (English) Zbl 1012.01002 Symmetry Cult. Sci. 10, No. 1-2, 189-197 (1999). MSC: 01A27 51-03 01A55 PDFBibTeX XMLCite \textit{H. Okumura}, Symmetry Cult. Sci. 10, No. 1--2, 189--197 (1999; Zbl 1012.01002)