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X.F. Qiu; R.H. Zhang; W.H. Li; G.L. Jin; B.X. Zhu. (1999). FREQUENCY-SELECTIVE ATTENUATION OF SOUND PROPAGATION AND REVERBERATION IN THE YELLOW SEA. , 220(2), 331–342. doi:10.1006/jsvi.1998.1959 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research