1. Handbook of mathematical functions, Chap. 7, 7th printing;Abramowitz,1968
2. Some basic relations for ultrasonic fields from circular transducers with a central hole;Beissner;Journal of the Acoustical Society of America,2012
3. Fundamentals of physical acoustics;Blackstock,2000
4. New approaches to the linear propagation of acoustic fields;Christopher;Journal of the Acoustical Society of America,1991
5. Steady state spherically focused circular aperture beam patterns;Goldstein;Ultrasound in Medicine and Biology,2006