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3. R. Collins, D.H. Michael and K.B. Ranger, The a.c. field around a plane semi-elliptical crack in a metal surface, in: “Proceedings of Thirteenth Symposium on Nondestructive Evaluation”. San Antonio, TX (1981).
4. D. Mirshekar-Syahkal, R. Collins and D.H. Michael. The influence of skin depth on crack measurement by the a.c. field technique, J. Nondestr. Eval., 3:65 (1982).
5. D.H. Michael, R. Collins, The a.c. field around a plane crack in a metal surface when the skin thickness is large, J. Nondestr. Eval., 3:19 (1982).