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Jorge García-Melián; Julio D. Rossi; José C. Sabina de Lis. (2010). Large solutions to an anisotropic quasilinear elliptic problem. , 189(4), 689–712. doi:10.1007/s10231-010-0132-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research