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Willa H. Drummond; George A. Gregory; Michael A. Heymann; Roderic A. Phibbs. (1981). The independent effects of hyperventilation, tolazoline, and dopamine on infants with persistent pulmonary hypertension. , 98(4), 603–611. doi:10.1016/s0022-3476(81)80775-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research