1. Ultrasonics and Their Scientific and Technical Applications;Bergman,1949
2. Ultrasound and medicine: A survey of experimental studies;Herrich;J. Accoust. Soc. Am.,1954
3. Biophysical Research Methods;Uber,1950
4. Present status of ultrasonic therapy;Buchtala;Brit. J. Phys. Med.,1952
5. Technique of ultrasonic therapy;Bauer;Brit. J. Phys. Med.,1951