K. Subramaniam, G. Goldstein, J. Popovics, and S. Shah. Proc. SPIE Vol. 3586, p. 129-136, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, Ajit K. Mal; Ed., volume 3586 of Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference, page 129-136. (January 1999)
M. Lin, A. Abatan, and W. Zhang. Proc. SPIE Vol. 3671, p. 297-304, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, Steve C. Liu; Ed., volume 3671 of Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference, page 297-304. (May 1999)
M. Wang, F. Xu, D. Satpathi, and Z. Chen. Proc. SPIE Vol. 3671, p. 328-336, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, Steve C. Liu; Ed., volume 3671 of Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference, page 328-336. (May 1999)