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D Alker; JE Arrowsmith; SF Campbell; PE Cross. (1991). Long-acting dihydropyridine calcium antagonists. 9. Structure activity relationships around amlodipine. , 26(9), 907–913. doi:10.1016/0223-5234(91)90132-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research