  The purpose of this paper is to investigate acoustic wave scattering by a
large number of bubbles in a liquid at frequencies near the Minnaert resonance
frequency. This bubbly media has been exploited in practice to obtain
super-focusing of acoustic waves. Using layer potential techniques we derive
the scattering function for a single spherical bubble excited by an incident
wave in the low frequency regime. We then derive the point scatter
approximation for multiple scattering by N bubbles. We describe several
numerical experiments based on the point scatterer approximation that
demonstrate the possibility of achieving super-focusing using bubbly media.
