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. (1998). 98/02276 Fluidized bed combustion unit for oil shale : Hammad, M. et al. Energy Convers. Manage., 1998 (Pub. 1997), 39, (3/4), 269–272. , 39(3), 206–0. doi:10.1016/s0140-6701(98)80473-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research