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Le Poul, E.; Bolea, C.; Girard, F.; Poli, S.; Charvin, D.; Campo, B.; Bortoli, J.; Bessif, A.; Luo, B.; Koser, A. J.; Hodge, L. M.; Smith, K. M.; DiLella, A. G.; Liverton, N.; Hess, F.; Browne, S. E.; Reynolds, I. J. . (2012). A Potent and Selective Metabotropic Glutamate Receptor 4 Positive Allosteric Modulator Improves Movement in Rodent Models of Parkinson's Disease. Journal of Pharmacology and Experimental Therapeutics, 343(1), 167–177. doi:10.1124/jpet.112.196063 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research