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Adham M. Abdou; S. Higashiguchi; K. Horie; Mujo Kim; H. Hatta; H. Yokogoshi. (2006). Relaxation and immunity enhancement effects of γ-Aminobutyric acid (GABA) administration in humans. , 26(3), 201–208. doi:10.1002/biof.5520260305 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research