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Ainslie, Michael A.; Leighton, Timothy G. . (2011). Review of scattering and extinction cross-sections, damping factors, and resonance frequencies of a spherical gas bubble. The Journal of the Acoustical Society of America, 130(5), 3184–. doi:10.1121/1.3628321 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research