Liu, Jian, and Zengqin Zhao. “p(x)-Biharmonic Equations Involving (h,r(x))-Hardy Singular Coefficients With No-Flux Boundary Conditions”. Topological Methods in Nonlinear Analysis, vol. 64, no. 2, Sept. 2024, pp. 561-76, doi:10.12775/TMNA.2024.016.