1. S.S. Udpa and W. Lord, “A fourier descriptor classification scheme for differential probe signals”, in Materials Evaluation, Vol. 42, (August 1984), pp. 1136–1141.
2. S.S. Udpa and W. Lord, “Fourier descriptor classification of magnetite buildup in PWR steam generators”, in Review of Progress in QNDE, Vol. 5A, eds. D.O. Thompson and D.E. Chimenti (Plenum, New York, 1987), pp. 233–240.
3. M. Carkhuff and S.S. Udpa, “An improved defect classification algorithm based on fuzzy set theory”, in Review of Progress in QNDE, Vol. 6A, eds. D.O. Thompson and D.E. Chimenti (Plenum, New York, 1988), pp. 791–798.
4. L. Udpa and S.S. Udpa, “Eddy current defect characterization using neural networks”, in Materials Evaluation, Vol. 48, (March 1990), pp. 342–347.
5. C.E. Chapman, A. Fahr, A. Pelletier, and D.R. Hay, “Artificial intelligence in the eddy current inspection of aircraft engine components”, in Materials Evaluation, (September 1991), pp. 1090–1094.