Khilkova, L.A. “The Smooth Dependence of the Solution of the Neumann Boundary-Value ‘cell’ Problem on the Parameters of a Domain”. Reports of the National Academy of Sciences of Ukraine, no. 4 (April 28, 2014): 32–36. Accessed June 20, 2026. https://nasu-periodicals.org.ua/index.php/dp/article/view/15777.