M. Belloni, B. Kawohl: A direct uniqueness proof for equations involving the $p$-Laplace operator manuscripta mathematica Vol. 109, N. 2, 2002 M. Belloni, B. Kawohl: The pseudo-$p$-Laplace eigenvalue problem and viscosity solutions as $p\to {\infty}$ ESAIM Control Optim. Calc. Var. Vol. 10, N. 1, 2003 M. Belloni, V. Ferone, B. Kawohl: Isoperimetric inequalities, Wulff shape and related questions for strongly nonlinear elliptic operators ZAMP Z. Angew. Math. Phys. Vol. 54, 2003 M. Belloni, A. Wagner: Newton's Problem of Minimal Resistance in the Class of Bodies with Prescribed Volume J. Convex Anal. Vol. 2, 2003