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M. Mahmoudian; A.H. Pakiari; S. Khademi. (1992). The mechanism of action and mode of inhibition of dihydroorotate dehydrogenase: A quantum chemical study. , 43(2), 0–287. doi:10.1016/0006-2952(92)90289-u 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research