1. L. E. Samuels, ?Metallographic Polishing by Mechanical Methods? (Pitman, Melbourne and London, 1967) p. 125.
2. G. Petzov, ?Metallographic Etching? (American Society for Metals, Metals Park, Ohio, 1978) p. 21 et sq.
3. H. E. N. Stone,Metallography 12 (1979) 117.
4. Idem, ibid. 11 (1978) 105.
5. Idem, J. Mater. Sci. 7 (1972) 1147.