Audoux, B., Bobkov, V. and Parini, E. (2018) “On multiplicity of eigenvalues and symmetry of eigenfunctions of the $p$-Laplacian”, Topological Methods in Nonlinear Analysis, 51(2), pp. 565–582. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.055 (Accessed: 24 April 2024).