1. M. Kawashima, in “Handbook of Membrane Application Technology” (in Japanese), ed. by D. Nomura and H. Ohya, Saiwaishobo,Tokyo, 1983, pp. 176–187.
2. M. Shibuta. in “Kinouseisyokuhin no Kaihatsutenbou” (in Japanese), C.M.C. Co., Ltd., Tokyo, 1988, pp. 74–88.
3. Japanese Industrial Standard (JIS) K 0102, in “Testing Methods for Industrial Wastewater” (in Japanese), Japanese Standard Association, 1981, p. 56.
4. Y. Hirose, in “Soy Sauce Experimental Method” (in Japanese), ed. by Japan Soy Sauce Research Institute, 1988. p. 6.
5. Japanese Industrial Standard (JIS) K 0102, in “Testing Methods for Industrial Wastewater” (in Japanese), Japanese Standard Association, 1981, p. 33.