D. V. Larin and I. V. Skrypnik, “Principle of additivity in averaging of degenerate nonlinear Dirichlet problems”, Ukr. Mat. Zhurn., vol. 50, no. 1, pp. 118–135, Jan. 1998, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4977