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Regina Rodrigo; Vicente Felipo. (2006). Brain regional alterations in the modulation of the glutamate–nitric oxide-cGMP pathway in liver cirrhosis: Role of hyperammonemia and cell types involved. , 48(6-7), 0–477. doi:10.1016/j.neuint.2005.10.014 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research