1. 1) F. A Lowenheim: Modern Electroplating, Wiley, New York, (1974), p. 287.
2. 2) R. J. Kendric: Trans. Inst. Met. Finish., 44 (1966), 78.
3. 3) A. J. Dill: Plating, 61 (1974), 1001.
4. 4) Y. M. F. Marikar and K. I. Vasu: Chem. Era., 6 (1970), 5.
5. 5) G. B. Hogaboom: V. S. Patent 2, 35, 966 (1944).