1. L. Smith, “The Bacteria,” Vol. II, ed. by G. Gunsalus and R. Y. Stainer, Academic Press Inc., New York, N.Y., 1961, p. 572.
2. N. S. Gelman, M. A. Lukoyanova and D. N. Ostrovskii, “Respiration and Phosphorylation of Bacteria,” Plenum Press, New York, 1967, p. 71.
3. W. Lamprecht and I. Trautschold, “Method of Enzymatic Analysis,” ed. by H. U. Bergmeyer, Academic Press Inc., New York, N.Y., 1963, p. 543.
4. T. Yamanaka, “The Biochemistry of Copper,” ed. by J. Peisach, P. Aisen and W. E. Blumberg, Academic Press Inc., New York, N.Y., 1966, p. 275.