1. Adams, R.: Sobolev Spaces. Elsevier, Oxford (2003)
2. Alvino, A., Chiacchio, F., Nitsch, C., Trombetti, C.: Sharp estimates for solutions to elliptic problems with mixed boundary conditions. J. Math. Pures Appl. 9(152), 251–261 (2021)
3. Alvino, A., Brock, F., Chiacchio, F., Mercaldo, A., Posteraro, M.R.: Some isoperimetric inequalities on $$\mathbb{R} ^{N}$$ with respect to weights $$\left|x\right|^{\alpha }$$. J. Math. Anal. Appl. 451(1), 280–318 (2017)
4. Alvino, A., Trombetti, G., Matarasso, S.: Elliptic boundary value problems: comparison results via symmetrization. Ricerche Mat. 51(2), 341–355 (2003)
5. Alvino, A., Nitsch, C., Trombetti, C.: A Talenti comparison result for solutions to elliptic problems with Robin boundary conditions, arXiv:1909.11950, to appear on Comm. Pure Applied Math