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Lorenz, Otto; Scheele, Walter; Redetzky, Wolfgang . (1957). The Vulcanization of Elastomers. X. The Vulcanization of Natural Rubber with Thiuram Disulfides (V). Rubber Chemistry and Technology, 30(3), 903–910. doi:10.5254/1.3542736 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research