Ikegami, Shunzō: Nihon no kōgaku kōgyō ni okeru gijutsu iten. Kokusan sokkyogi no kenkyū kaihatsu o tsūjite (1913 nen – 1923 nen) (Technology transformation of the optical industry in Japan. Research and development of Japanese rangefinders, 1913-1927), in: Kagakusi kenkyu, Series 2 47/3, 2008, pp. 129-139.