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Li, Yu Hao; Cheng, Le Feng; Xi, Lei; Xu, Guan Hong; Yu, Tao . (2014). Suggestions on Implementing Energy-Saving Diagnosis Technologies and Services of Power Grid Enterprises. Applied Mechanics and Materials, 596(), 682–686. doi:10.4028/www.scientific.net/amm.596.682 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research