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Michael B. Simsqn; Wesley R. Harden III; Clyde H. Barlow; Alden H. Harken. (1979). Epicardial ischemia as delineated with epicardial S-T segment mapping and nicotinamide adenine dinucleotide (NADH) fluorescence photography. , 44(2), 0–269. doi:10.1016/0002-9149(79)90315-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research