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Khadilkar, Bhushan M.; Madyar, Virendra R. . (2001). Scaling Up of Dihydropyridine Ester Synthesis by Using Aqueous Hydrotrope Solutions in a Continuous Microwave Reactor. Organic Process Research & Development, 5(4), 452–455. doi:10.1021/op010026q 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research