1. D. M. Neville, Jr. and H. Glossmann, in “Method in Enzymology,” Vol. 32, ed. by S. Fleischer and I. Packer, Academic Press Inc., New York, 1974, p. 92.
2. K. Sugawara and M. Soejima, in “Tanpakushitsu no Teiryoho,” (Methods of Protein Determination), 2nd ed., Gakkai Shuppan Center, Tokyo, 1978, p. 123.