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Jo, Yeon Hwa; Jang, Jin Woo; Cho, Yong Soo . (2014). Spatial and RF power dependence of the structural and electrical characteristics of copper zinc tin selenide thin films prepared by single elementary target sputtering. Materials Chemistry and Physics, 148(1-2), 175–180. doi:10.1016/j.matchemphys.2014.07.028 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research