On a three critical points theorem for non-differentiable functions and applications to nonlinear boundary value problems

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Non-differentiable functionals and applications to elliptic problems with discontinuous nonlinearities (2008, background): “3) that improve the results in [29] and [30] and, consequently, in [35] and [36] (see Remarks 3.”
Three solutions for a nonlocal Dirichlet boundary value problem involving the p(x)-Laplacian (2013, background): “In 2002, Marano and Motreanu [38] extended Ricceri’s result to a large class of non-differentiable functionals and gave an application to a semilinear elliptic eigenvalue problem with highly discontinuous nonlinearities.”
A three critical points theorem and its applications to the ordinary Dirichlet problem (2003, background): “Applications of Theorem A to nonlinear boundary value problems have been given in [2]‐[4], [6]‐[8], [12], [15], (see also [ 13 ] for the non smooth case), establishing multiplicity results for equations depending on a parameter .”