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Mottaghi, M.; Khorasani, S. N.; Esfahany, M. N.; Farzadfar, A.; Talakesh, M. . (2012). Comparison of the effect of nano ZnO and conventional grade ZnO on the cross-linking densities of NR/BR and NR/SBR blends. Journal of Elastomers and Plastics, 44(5), 443–451. doi:10.1177/0095244312439446 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research