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A. Hartley; S. J. C. Irvine. (2000). The effects of the growth parameters of the CdS window layer on the photovoltaic properties of MOCVD-grown CdS/CdTe solar cells. , 11(7), 569–573. doi:10.1023/a:1026547902527 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research