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Ultrasonic Imaging and Quantitative Nondestructive Evaluation of the Hearts of Patients
http://www.auditory.org/asamtgs/asa93dnv/3aPA/3aPA6.html
by James G. Miller, Volume 14B; Samuel A. Wickline
http://www.auditory.org/asamtgs/asa93dnv/3aPA/3aPA6.html