1. Blum N A and Feldman C 1972J. Non-Cryst. Solids 11 242
2. Chandrashekhar G V, Gupta D, Newcomb S, Spit F H M and Tu K N 1987Proc 7th Int. Conf. on Thin Films (ed.) K L Chopra (Sequola: Elsevier)
3. Charlot G 1964Colorimetric determination of elements (Amsterdam: Elsevier)
4. Chopra K L 1969Thin film phenomena (New York: McGraw Hill) pp. 199, 449
5. Das D and Banerjee R 1987Thin Solid Films 147 321