Namleeva, Yu. V., and I. V. Skrypnik. “Convergence of Eigenvalues and Eigenfunctions of Nonlinear Dirichlet Problems in Domains With Fine-Grain Boundary”. Ukrains’kyi Matematychnyi Zhurnal 55, no. 6 (June 25, 2003): 824–839. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/3957.