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King, R. J.; Cho, S. H.; Jaggard, D. L.; Sokolov, V. . (1973). Height-gain experimental data for groundwave propagation: 1, Homogeneous paths. Radio Science, 8(1), 7–15. doi:10.1029/rs008i001p00007 

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