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J. R. Dimmock; L. M. Smith. (1980). Syntheses and evaluation of ketals, hemithioketals, and dithioketals of conjugated styryl ketones principally for antineoplastic activity. , 69(5), 575–580. doi:10.1002/jps.2600690527 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research