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Stinemetz, C. L.; Kuzmanoff, K. M.; Evans, M. L.; Jarrett, H. W. . (1987). Correlation between Calmodulin Activity and Gravitropic Sensitivity in Primary Roots of Maize. PLANT PHYSIOLOGY, 84(4), 1337–1342. doi:10.1104/pp.84.4.1337 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research