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Jean C. Parker; Frederick J. Di Carlo; Ivan W.F. Davidson. (1975). Comparative vasodilator effects of nitroglycerin, pentaerythritol trinitrate and biometabolites, and other organic nitrates. , 31(1), 29–37. doi:10.1016/0014-2999(75)90075-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research