[1]
A. A. Murach, “Douglis-Nirenberg elliptic systems in the refined scale of spaces on a closed manifold”, MFAT, vol. 14, no. 2, pp. 142–158, Jun. 2008, Accessed: Dec. 17, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/378