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Feng, Lili; Song, Ping; Yan, Shicheng; Wang, Haibo; Wang, Jie . (2015). The shape-stabilized phase change materials composed of polyethylene glycol and graphitic carbon nitride matrices. Thermochimica Acta, 612(), 19–24. doi:10.1016/j.tca.2015.05.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research