Los’ VM, Roitberg YA. On the Sobolev problem in the complete scale of Banach spaces. Ukr. Mat. Zhurn. [Internet]. 1999 Sep. 25 [cited 2025 Apr. 7];51(9):1181–1192. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4714