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Shapiro, Irwin I.; Ash, Michael E.; Ingalls, Richard P.; Smith, William B.; Campbell, Donald B.; Dyce, Rolf B.; Jurgens, Raymond F.; Pettengill, Gordon H. . (1971). Fourth Test of General Relativity: New Radar Result. Physical Review Letters, 26(18), 1132–1135. doi:10.1103/PhysRevLett.26.1132 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research