I. S. Chepurukhina and A. A. Murach, “Elliptic problems in the sense of B. Lawruk on two-sided refined scales of spaces”, MFAT, vol. 21, no. 1, pp. 6–21, Mar. 2015, Accessed: Dec. 18, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/597