1. MacClean, W. R., US Patent 2 573 799, Nov. 1951.
2. Schmidt, T. R., “The Remote Field Eddy Current Inspection Technique.”, Materials Evaluation, 42, pp. 225–230, February 1984.
3. Lord, W., Sun, Y. S., Udpa, S.S., and Nath, S., “A Finite Element Study of the Remote Field Eddy Current Phenomenon,” IEEE Trans, on Magnetics, Vol. 24, No. 1, pp. 435–438, January 1988.
4. Sun, Y.-S., “Finite Element Study of Diffusion Energy Flow in Low-Frequency Eddy Current Fields,” Materials Evaluation, 47, pp. 87–92, January 1989.
5. W. Chen, G. S. Zhang, Y. S. Sun and M. J. Chen, “Integrated Third Kind Boundary Condition for 2D Eddy Current Problems and Its Application in NDT”, IEEE Trans, on Magnetics, Vol. 29, No. 2, pp. 1812–1815, March 1993.