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Jing, Shuailin; Li, Tao; Li, Xiaojuan; Xu, Qian; Hu, Jing; Li, Ruihai . (2014). Phenolic foams modified by cardanol through bisphenol modification. Journal of Applied Polymer Science, 131(4), n/a–n/a. doi:10.1002/app.39942 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research