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Enrique Flores; Alicia M. Muro-Pastor. (1990). Mutational and kinetic analysis of basic amino acid transport in the cyanobacteriumSynechocystissp. PCC 6803. , 154(6), 521–527. doi:10.1007/bf00248831 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research