1. D. R. Adams and L. I. Hedberg, Function Spaces and Potential Theory, Grundlehren der Mathematischen Wissenschaften, Vol. 314, Springer, Berlin, 1996.
2. R. A. Adams and J. J. F. Fournier, Sobolev Apaces, Pure and Applied Mathematics (Amsterdam), Vol. 140, Elsevier/Academic Press, Amsterdam, 2003.
3. K. Adimurthi and N. C. Phuc, Global Lorentz and Lorentz–Morrey estimates below the natural exponent for quasilinear equations, Calculus of Variations and Partial Differential Equations 54 (2015), 3107–3139.
4. A. Alberico, I. Chlebicka, A. Cianchi and A. Zatorska-Goldstein, Fully anisotropic elliptic problem with minimally integrable data, Calculus of Variations and Partial Differential Equations 58 (2019), Article no. 186.
5. D. Arcoya and L. Boccardo, Regularizing effect of the interplay between coefficients in some elliptic equations, Journal of Functional Analysis 268 (2015), 1153–1166.