1. Testing and calibration of ultrasonic therapeutic equipment;IEC 150,1963
2. Radiation Safety Performance Standard, Ultrasound therapy products;FDA;10 FDA (Food and Drug Administration), Rules and Regulations,1979
3. Medical electrical equipment, Part 2: Particular requirements for the safety of ultrasonic therapy equipment;IEC 601-2-5,1984
4. Development of standard measurement methods for essential properties of ultrasound therapy equipment;Hekkenberg;BCR Information, Applied Metrology, Synthesis Report No. EUR 14761 EN,1993
5. BCR/NPL Report, Development of standard measurement methods for essential properties of ultrasound therapy equipment;Zeqiri;Contribution of NPL, NPL Report RSA(EXT)36,1993