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Javier Márquez; Amada R. López de la Oliva; José M. Matés; Juan A. Segura; Francisco J. Alonso. (2006). Glutaminase: A multifaceted protein not only involved in generating glutamate. , 48(6-7), 0–471. doi:10.1016/j.neuint.2005.10.015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research