AnopA. V., and MurachA. A. “Regular Elliptic Boundary-Value Problems in the Extended Sobolev Scale”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 7 (July 25, 2014): 867–883. Accessed October 6, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2185.