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Thomas Huld; Gabi Friesen; Artur Skoczek; Robert P. Kenny; Tony Sample; Michael Field; Ewan D. Dunlop. (2011). A power-rating model for crystalline silicon PV modules. , 95(12), 3359–3369. doi:10.1016/j.solmat.2011.07.026 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research