A further three critical points theorem

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Three solutions for a nonlocal Dirichlet boundary value problem involving the p(x)-Laplacian (2013, background): “3 of 47 which do are established by Ricceri 48 different from the results of Lemma 3.”
Multiple solutions for an eigenvalue problem involving p-Laplacian type operators (2012, unknown): “See also [4–15].”
On a fractional degenerate Kirchhoff-type problem (2017, methodology): “The variational tool used to derive the existence of such critical points is a multiplicity result established in [36] that we recall for ease of reference in Section 4.”