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Larsen, F. J.; Schiffer, T. A.; Ekblom, B.; Mattsson, M. P.; Checa, A.; Wheelock, C. E.; Nystrom, T.; Lundberg, J. O.; Weitzberg, E. . (2014). Dietary nitrate reduces resting metabolic rate: a randomized, crossover study in humans. American Journal of Clinical Nutrition, 99(4), 843–850. doi:10.3945/ajcn.113.079491 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research