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Wagner, P.H.; Wittmann, M. . (2014). Influence of Different Operation Strategies on Transient Solar Thermal Power Plant Simulation Models with Molten Salt as Heat Transfer Fluid. Energy Procedia, 49(), 1652–1663. doi:10.1016/j.egypro.2014.03.174 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research