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Harvey, J. S.; Carey, W. F.; Nelson, P. V.; Morris, C. P. . (1994). Metachromatic leukodystrophy: a nonsense mutation (Q486X) in the arylsulphatase A (ARSA) gene. Human Molecular Genetics, 3(1), 207–207. doi:10.1093/hmg/3.1.207 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research