Motokiti Kondō
Bibliography
Kondō, Motokiti. 1964. “Mathematics in Modern Japan.” Philosophia Mathematica s1-1(2): 89–95, doi:10.1093/philmat/s1-1.2.89.
Kondō, Motokiti. 1989. “A1 is Not a Conservative Extension of S4 but of S5.” The Journal of Philosophical Logic 18(3): 321–323.