1. H. E. Exner,Int. Metall. Rev. 17 (1972) 25.
2. F. E. Underwood, in ?Quantitative Microscopy?, edited by R. T. DeHoff and F. N. Rhines (McGraw-Hill, New York, 1968) p. 149.
3. R. T. Dehoff andP. Bousquet,J. Microscopy 92 (1970) 119.
4. C. S. Smith,Trans. ASM 45 (1953) 533.
5. F. Schuckher, in ?Quantitative Microscopy?, edited by R. T. DeHoff and F. N. Rhines (McGraw-Hill, New York, 1968) p. 201.