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Reichl, Ch.; Kramer, K.; Thoma, Ch.; Benovsky, P.; Lemée, T. . (2015). Comparison of modelled heat transfer and fluid dynamics of a flat plate solar air heating collector towards experimental data. Solar Energy, 120(), 450–463. doi:10.1016/j.solener.2015.07.011 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research