Wave scattering from encapsulated microbubbles subject to high-frequency ultrasound: contribution of higher-order scattering modes.
Chen J, Hunter KS, Shandas R. Wave scattering from encapsulated microbubbles subject to high-frequency ultrasound: contribution of higher-order scattering modes. J Acoust Soc Am. 2009 Oct; 126(4):1766-75.