R. Maaskant, A. Alavie, R. Measures, M. Ohn, S. Karr, D. Glennie, C. Wade, G. Tadros, and S. Rizkalla. Proc. SPIE Vol. 2191, p. 457-465, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, James S. Sirkis; Ed., volume 2191 of Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference, page 457-465. (May 1994)