1. Mapping Ultrasonic fields with cholesteric liquid crystals;Cook;Ultrasonics,1971
2. Evaluation of ultrasound therapy devices;Hekkenberg;Physiotherapy,1986
3. IEC 61689 Ultrasonics, Physiotherapy systems. Field specifications and methods of measurement in the frequency range 0.5 MHz to 5 MHz. Edition 2.0 2007
4. IEC TS62462 Ultrasonics, Output test. Guide for the maintenance of ultrasound physiotherapy systems. First edition 2007-05
5. Visualization of thermal distribution caused by focused ultrasonic field in an agar phantom;Jungsoon;Proc Symp Ultrason Electronics,2010