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A.M. Dziewonski; G. Ekström; M.P. Salganik. (1996). Centroid-moment tensor solutions for July–September 1995. , 97(1-4), 0–13. doi:10.1016/0031-9201(96)03159-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research