N. Ishida

Japanese fermented soybean food as the major determinant of the large geographic difference in circulating levels of vitamin K2: possible implications for hip-fracture risk.

Y. Ouchi, S. Inoue, S. Hedges, 2001, Nutrition.

Variation in moisture, total sugar, and carotene content of Japanese carrots: Use in sample size determination

S. Naito, A. Yasui, N. Ishida, 2009 .