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Tholen, D.; Zhu, X.-G. . (2011). The Mechanistic Basis of Internal Conductance: A Theoretical Analysis of Mesophyll Cell Photosynthesis and CO2 Diffusion. PLANT PHYSIOLOGY, 156(1), 90–105. doi:10.1104/pp.111.172346 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research