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Brody, T. M.; Temma, K.; Kennedy, R. H.; Akera, T. . (1984). The dual effect of sodium ion on the digitalis-sodium pump interaction. European Heart Journal, 5(suppl F), 291–296. doi:10.1093/eurheartj/5.suppl_f.291 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research