Dmytryshyn, M.I. “Interpolated Scales of Approximation Spaces for Regular Elliptic Operators on Compact Manifolds”. Carpathian Mathematical Publications 6, no. 1 (July 19, 2014): 26–31. Accessed November 22, 2024. https://ktipe.pnu.edu.ua/index.php/cmp/article/view/1331.