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Hoffman, J. H.; Hodges, R. R.; Donahue, T. M.; McElroy, M. B. . (1980). Composition of the Venus lower atmosphere from the Pioneer Venus Mass Spectrometer. Journal of Geophysical Research, 85(A13), 7882–. doi:10.1029/ja085ia13p07882 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research