Gorbachuk ML, Mokrousov YG. On density of some sets of infinitely differentiable vectors of a closed operator on a Banach space. MFAT [Internet]. 2002 Mar. 25 [cited 2025 Dec. 18];8(1):23-9. Available from: https://zen.imath.kiev.ua/index.php/mfat/article/view/173