@Article{ BriButPri21, author = { Briani, Luca and Buttazzo, Giuseppe and Prinari, Francesca }, title = { Inequalities between torsional rigidity and principal eigenvalue of the $p$-Laplacian }, journal = { Calc. Var. Partial Differ. Equ. }, year = { 2021 }, pages = { }, URL = { http://cvgmt.sns.it/paper/5138/ }, note = { cvgmt preprint} }