1. Acoustic Output Measurement Standard for Diagnostic Ultrasound Equipment, Revision 1, Standards Publication UD 2-2003, National Electrical Manufacturers Association, 1300 North 17th Street, Suite 1847, Rosslyn VA 22209, 2003.
2. Information for Manufacturers Seeking Marketing Clearance of Diagnostic Ultrasound Systems and Transducers, Center for Devices and Radiological Health, FDA, 1985, and revised in 1989, 1990, 1991, 1993, 1994, 1997.
3. Standard for Real-Time Display of Thermal and Mechanical Acoustic Output Indices on Diagnostic Ultrasound Equipment, Revision 2, Standards Publication UD 3-2003, National Electrical Manufacturers Association, 1300 North 17th Street, Suite 1847, Rosslyn VA 22209, 2003.
4. Evaluation of acoustical parameter sensitivity to age-related and ostearthritic changes in articular cartilage using 50MHz ultrasound;Cherin;Ultrasound Med. Biol.,1998
5. Imaging and spectrum analysis of contrast agents in the in-vivo rabbit eye using very-high-frequency ultrasound;Dneg;Ultrasound Med. Biol.,1998