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M. Costagliola; R. Greco; E. Martuscelli. (1978). Melt viscosity and thermal properties of poly(ethylene oxide) fractions and blends. , 19(7), 860–862. doi:10.1016/0032-3861(78)90022-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research