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Simsek, Suleyman; Uslu, Samet . (2020). Investigation of the impacts of gasoline, biogas and LPG fuels on engine performance and exhaust emissions in different throttle positions on SI engine. Fuel, 279(), 118528–. doi:10.1016/j.fuel.2020.118528 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research