2New R, Becker RI, Wihelmij P. A limiting form for the nearfield of the baffled piston. J Acoust Soc Am, 1981, 70(5):1518-1526
3Hasheminejad SM, Azarpeyvand M. Acoustic radiation from a pulsating spherical cap set on a spherical baffle near a hard/soft flat surface. IEEE J Oceanic Eng, 2004, 29(1): 110-117