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George J. Peckham; William W. Fox. (1978). Physiologic factors affecting pulmonary artery pressure in infants with persistent pulmonary hypertension. , 93(6), 1005–1010. doi:10.1016/s0022-3476(78)81239-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research