Ey. Wang et Gh. Du, ELASTIC-WAVE RADIATION AND DIFFRACTION OF A PISTON SOURCE - COMMENTS, The Journal of the Acoustical Society of America, 101(4), 1997, pp. 2374-2375
It is noted that the second item in Eq. (12) [J. Acoust. Sec. Am. 87,
1894 (1990)] could not be ignored at low frequencies. Meanwhile, a pre
cise solution for Eq. (1) without overflow problems is proposed at hig
h frequencies. (C) 1997 Acoustical Society of America.