1. Imoto, T. and Yagishita, K. (1971). A simple activity measurement of lysozyme. Agric. Biol. Chem., 35, 1154-1156.
2. Kajimoto, O., Sakamoto, K., Takamori, Y., Kajitani, N., Imanishi, T., Matsuo, R. and Kajitani, Y. (1998). Therapeutic activity of oral glucosamine hydrochloride in osteoarthritis of the knee: A placebo-controlled, double-blind, cross-over study. Nippon Rinsho Eiyo Gakkaishi, 20, 41-47 (in Japanese).
3. Kikuchi, K. (2001). Characteristics and effects of natural N-acetyl-glucosamine “Marine Sweet”. Japan Fudo Saiensu, 40, 52-56 (in Japanese).