Comment on ``Air bubbles in water: A strongly multiple scattering medium   for acoustic waves" [Phys. Rev. Lett. 84, 6050, 2000]
  We comment on a recent Letter in Phys. Rev. Lett. (M. Kafesaki, R. S. Penciu, and E. N. Economou, Phys. Rev. Lett. {\bf 84}, 6050 (2000)) 
Z. Ye, Y. Y. Chen, and A. Alvarez