1. 1) R. V. WILLIAMS : Electroplating and Metal Finishing, 19 (1966), p. 92
2. 2) E. C. KEDWARD : Electroplating and Metal Finishing, 25 (1972), p. 20
3. 3) R. BAZZARD and P. J. BODEN : Trans. Inst. Metal Finishing, 50 (1972), p. 63
4. 6) S. J. HARRIS and BODEN : Electroplating and Metal Finishing, 26 (1973), p. 9
5. 7) M. PUSHPAVANAM, G. VARADAJAN, S. KRISHNAMURTHY, and B. A. SENOI : Electroplatingand Metal Finishing, 27(1974), p. 10