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Walton, Edward; Wagner, Arthur F.; Bachelor, Frank W.; Peterson, Louis H.; Holly, Frederick W.; Folkers, Karl . (1955). Synthesis of (+)-α-Lipoic Acid and its Optical Antipode <sup>1</sup>. Journal of the American Chemical Society, 77(19), 5144–5149. doi:10.1021/ja01624a057 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research