IEEE 1990 ultrasonics symposium: proceedings (December 4-7, 1990 ; Honolulu, HI) : SPONSORED BY THE ULTRASONICS FERROELECTRIC AND FREQUENCY CONTROL SOCIETY. VOL. 3. - IEEE ULTRASONICS SYMPOSIUM; McAvoy, B.R. (Piscataway : The Institute of Electrical and Electronics Engineers, Inc., 1990)