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Xu, Zhijie; Diao, Ruisheng; Lu, Shuai; Lian, Jianming; Zhang, Yu . (2014). Modeling of Electric Water Heaters for Demand Response: A Baseline PDE Model. IEEE Transactions on Smart Grid, 5(5), 2203–2210. doi:10.1109/tsg.2014.2317149 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research