1. Ise, N., Okubo, T.: Mean Activity Coefficient of Polyelectrolytes. I. Measurements of Sodium Polyacrylates. J. Phys. Chem. 69, 4102 (1965).
2. Harned, H. S.: A treatise on physical chemistry. Taylor, H. S. (Ed.). New York: D. Van Nostrand Co., 1924.
3. Guggenheim, E. A.: Studies of cells with liquid-liquid junctions. Part II. Thermodynamic significance and relationship to activity coefficients. J. Phys. Chem. 34, 1758 (1930).
4. Rice, S. A., Nagasawa, M.: Polyelectrolyte solutions, 1st Ed., Chap. 8. New York: Academic Press Inc., 1961.
5. See, for example: Bates, R. G.: Determination of pH, Theory and Practice, Chap. 3. New York: John Wiley & Sons, Inc., 1964.