1. Effect of u/s on tendon extensibility;Gersten;Am. J. Phys. Med.,1955
2. Effect of ultrasonic energy on bloodflow;Imig;Am. J. Phys. Med.,1954
3. Extracorporeally induced destruction of kidney stones by shock waves;Chaussy;Lancet,1980
4. Therapeutic applications of ultrasound;ter Haar;Prog. Biophys. Molec. Biol.,2007
5. International Electrotechnical Commission, Testing and calibration of ultrasonic therapeutic equipment, IEC 150, 1963.