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A. G. Lyapin; E. L. Gromnitskaya; O. F. Yagafarov; O. V. Stal’gorova; V. V. Brazhkin. (2008). Elastic properties of crystalline and liquid gallium at high pressures. , 107(5), 818–827. doi:10.1134/s1063776108110125 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research