1. Wang, N. and R. Zoughi, "Moment Method Solution for Modeling the Interaction of Open-ended Coaxial Probes and Surface Cracks in Metals," Materials Evaluation, vol. 60, no. 10, pp. 1253-1258, October 2002.

2. Wang, Y. and R. Zoughi, "Interaction of Surface Cracks in Metals with Open-Ended Coaxial Probes at Microwave Frequencies" Materials Evaluation, vol. 58, no. 10, pp. 1228-1234, October 2000.
3. Qaddoumi, N., E. Ranu, J.D. McColskey, R. Mirshahi and R. Zoughi, "Microwave Detection of Stress Induced Fatigue Cracks in Steel and Potential for Crack Opening Determination," Research in Nondestructive Evaluation, vol. 12, no. 2, pp. 87-103, 2000.
4. Zoughi, R., S.I. Ganchev and C. Huber, "Microwave Measurement-Parameter Optimization for Detection of Surface Breaking Hairline Cracks in Metals," Nondestructive Testing & Evaluation, vol. 14, pp. 323-337, 1998.
5. Huber, C., H. Abiri, S. Ganchev and R. Zoughi, "Modeling of Surface Hairline Crack Detection in Metals Under Coatings Using Open-Ended Rectangular Waveguides," IEEE Transactions on Microwave Theory and Techniques, vol. 45, no. 11, pp. 2049-2057, November 1997.
6. Huber, C., S.I. Ganchev, R. Mirshahi, J. Easter and R. Zoughi, "Remote Detection of Surface Cracks/Slots Using Open-Ended Rectangular Waveguide Sensors: An Experimental Investigation" Nondestructive Testing & Evaluation, vol. 13, pp. 227-237, 1997.
7. Huber, C., H. Abiri, S. Ganchev and R. Zoughi, "Analysis of the Crack Characteristic Signal Using a Generalized Scattering Matrix Representation," IEEE Transactions on Microwave Theory and Technique, vol. 45, no. 4, pp. 477-484, April, 1997.
8. Ganchev, S., R. Zoughi, C. Huber, R. Runser and E. Ranu, "Microwave Method for Locating Surface Crack Tips in Metals," Materials Evaluation, vol. 54, no. 5, pp. 598-603, May, 1996.
9. Yeh, C. and R. Zoughi, "Sizing Technique for Surface Cracks in Metals," Materials Evaluation, vol. 53, no. 4, pp. 496-501, April, 1995.
10. Yeh, C. and R. Zoughi, "Microwave Detection of Finite Surface Cracks in Metals Using Rectangular Waveguide Sensors," Research in Nondestructive Evaluation, vol. 6, no. 1. pp. 35-55, 1994.
11. Yeh, C. and R. Zoughi, "A Novel Microwave Method for Detection of Long Surface Cracks in Metals," IEEE Transactions on Instrumentation and Measurement, vol. 43, no. 5, pp. 719-725, October, 1994.
12. Yeh, C., E. Ranu and R. Zoughi, "A Novel Microwave Method for Surface Crack Detection Using Higher Order Waveguide Modes," Materials Evaluation, vol. 52, no. 6, pp. 676-681, June, 1994.
13. Welty, H. and R. Zoughi, "Statistical Crack Detection Capabilities of Microwave Waveguide Probes Designed for Detecting Fatigue Cracks in Steel Bridges," Presented at the Structural Materials Technology (SMT): NDE/NDT for Highways and Bridges Topical Conference, Cincinnati, OH, September 10-13, 2002.
14. Campbell, H., F. Bastidas, E. Winkler, R. Zoughi, D. Raymond and D. Williams, "Optimization of Microwave Inspection Techniques of Bridge Fatigue Cracks," ASNT 2000 Fall Conference, Paper Summaries, pp.183-184 ,Indianapolis, IN, November 14-17, 2000.
15. Wang, N., K. Donnell, M. Castle, R. Zoughi and M. Novack, "Optimization Issues Associated with Fatigue Crack Detection in Metals Including Covered Cracks," Proceedings of the Twenty-seventh Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 20, Ames, IA, July 17-21, 2000.
16. Campbell, H., E. Winkler, N. Qaddoumi, R. Zoughi, D. Raymond, D. Williams and J. Meheen, "Microwave Inspection of Bridge Fatigue Cracks in Railroad Overpass," Proceedings of the Twenty-seventh Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 20A, pp. 438-445, Ames, IA, July17-21, 2000.
17. Wang, Y., N. Qaddoumi, M. Frank, R. Mirshahi, V. Otashevich and R. Zoughi, "Microwave Detection of Machined Notches in Stainless Steel with Rough Surface," Proceedings of the Twenty-Fifth Annual Review of Progress in Quantitative Nondestructive Evaluation, vol. 18A, pp. 577-583, Snowbird, UT, July 19-24, 1998.
18. Qaddoumi, N., P. Stepanek, R. Mirshahi, E. Ranu, R. Zoughi, J.D. McColskey and R. Livingston, "Influence of Flange, Frequency and Liftoff on Microwave Detection of Stress Induced Fatigue Cracks Using Open-Ended Rectangular Waveguide," Proceedings of the SPIE Symposium on Nondestructive Evaluation Techniques for Aging Infrastructure Manufacturing, vol. 3396, pp. 208-215, San Antonio, TX, March 1998.
19. Qaddoumi, N., E. Ranu, R. Mirshahi, V. Otashevich, R. Zoughi, J.D. McColskey and R. Livingston, "Quantitative Analysis of Loading vs. Microwave Crack Detection Sensitivity Using Higher-Order Mode Sensors," Proceedings of the International Workshop on Structural Health Monitoring, Stanford University, Stanford, CA, pp. 752-761, September 18-20, 1997.
20. Qaddoumi, N., H. Abiri, S. Ganchev and R. Zoughi, "Near-Field Analysis of Rectangular Waveguide Probes Used for Imaging," Proceedings of the Review of Progress in Quantitative NDE, vol. 15A, pp. 727-732, Plenum Press, NY, 1995.
21. Zoughi, R., R. Salem, C. Huber and H. Abiri "Microwave/mm-Wave Detection of Surface Cracks Filled with a Dielectric Using an Open-Ended Waveguide," ASNT Spring'95 Conference Paper Summaries, pp. 46-48, Las Vegas, NV, March 20-24, 1995.
22. Huber, C. and R. Zoughi, "Higher Order Modes as Indicators of Surface Cracks Under Stratified Dielectric Coatings Using an Open-Ended Waveguide," Proceedings of the Review of Progress in Quantitative NDE, vol. 14A, pp. 637-642, 1995.

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