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Alfred Hassner; Larry R. Krepski; Vazken Alexanian. (1978). Aminopyridines as acylation catalysts for tertiary alcohols. , 34(14), 2069–2076. doi:10.1016/0040-4020(78)89005-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research