Robert D. Finch
Dept. of Mech. Eng., Univ. of Houston, Houston, TX 77204-4792
Mao et al. [J. Acoust. Soc. Am. 93, 2379 (1993)] have revived interest in the subject of the dynamics of vapor bubbles, including the issue of ``double'' resonances. Some earlier work on this topic will be summarized, and a possible application will be discussed.