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Harper, John; Price, Duncan; Zhang, Jie . (2005). Use of Fillers to Enable the Microwave Processing of Polyethylene. Journal of Microwave Power and Electromagnetic Energy, 40(4), 219–227. doi:10.1080/08327823.2005.11688543 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research