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Callan, J. E.; Hess, W. M.; Scott, C. E. . (1971). Elastomer Blends. Compatibility and Relative Response to Fillers. Rubber Chemistry and Technology, 44(3), 814–837. doi:10.5254/1.3544796 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research