Geodesic
Existence and multiplicity of solutions of quasilinear equations with convex or nonconvex reaction term
Contemporary Mathematics. Fundamental Directions, Proceedings of the Fifth International Conference on Differential and Functional-Differential Equations (Moscow, August 17–24, 2008). Part 1, Tome 35 (2010), pp. 118-125.

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We give existence, nonexistence and multiplicity results of nonnegative solutions for Dirichlet problems of the form $$ -\Delta_pv=\lambda f(x)(1+g(v))^{p-1}\quad\text{in}\quad\Omega,\qquad u=0\quad\text{on}\quad\partial\Omega, $$ where $\Delta_p$ is the $p$-Laplacian $(p>1)$, $g$ is nondecreasing, superlinear, and possibly convex, $\lambda>0$ and $f\in L^1(\Omega)$, $f\ge0$. New information on the extremal solutions is given. Equations with measure data are also considered. 
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H. A. Hamid; M. F. Bidaut-Veron. Existence and multiplicity of solutions of quasilinear equations with convex or nonconvex reaction term. Contemporary Mathematics. Fundamental Directions, Proceedings of the Fifth International Conference on Differential and Functional-Differential Equations (Moscow, August 17–24, 2008). Part 1, Tome 35 (2010), pp. 118-125. http://geodesic.mathdoc.fr/item/CMFD_2010_35_a8/

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