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Albert, K. R.; Ro-Poulsen, H.; Mikkelsen, T. N.; Michelsen, A.; van der Linden, L.; Beier, C. . (2011). Interactive effects of elevated CO2, warming, and drought on photosynthesis of Deschampsia flexuosa in a temperate heath ecosystem. Journal of Experimental Botany, 62(12), 4253–4266. doi:10.1093/jxb/err133 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research