1. 2)W. M. Latimer ; The Oxidation States of the Elements and their Potentials in Aqueous Solutions(2nd ed.),(Prentice-hall INC., Englewood Cliffs, N. J., 1959).
2. 5)O. Kubaschewski, C. B. Alcock ; Metallurgical Thermochemistry(5th ed. Revised and enlarged),(Elsevier, New York, 1979).