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Eli Tannenbaum; Isaac R Kaplan. (1985). Role of minerals in the thermal alteration of organic matter—I: Generation of gases and condensates under dry condition. , 49(12), 2589–2604. doi:10.1016/0016-7037(85)90128-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research