Ikai, M., Yamakawa, J., Ogawa, S., Akutsu, K., Masuda, M., Matsumoto, Y. Julkaisussa Association for the Scientific Studies on Judo, Kodokan (1958)
Ikai, M., Matsumoto, Y. Julkaisussa Association for the Scientific Studies on Judo, Kodokan (1958)