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Ghasem Najafpour; Habibollah Younesi. (2006). Ethanol and acetate synthesis from waste gas using batch culture of Clostridium ljungdahlii. , 38(1-2), 223–228. doi:10.1016/j.enzmictec.2005.06.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research