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Voorhoeve, R. J. H.; Remeika, J. P.; Freeland, P. E.; Matthias, B. T. . (1972). Rare-Earth Oxides of Manganese and Cobalt Rival Platinum for the Treatment of Carbon Monoxide in Auto Exhaust. Science, 177(4046), 353–354. doi:10.1126/science.177.4046.353 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research