Murach, A.A., and I.S. Chepurukhina. 2024. “Elliptic Problems With Nonclassical Coundary Conditions in an Extended Sobolev Scale”. Reports of the National Academy of Sciences of Ukraine, no. 8 (March). Kyiv, Ukraine:3-10. https://doi.org/10.15407/dopovidi2020.08.003.