Citation: Sa. Marano et D. Motreanu, On a three critical points theorem for non-differentiable functions and applications to nonlinear boundary value problems, NONLIN ANAL, 48(1), 2002, pp. 37-52
Citation: Sa. Marano et D. Motreanu, Existence of two nontrivial solutions for a class of elliptic eigenvalue problems, ARCH MATH, 75(1), 2000, pp. 53-58