[1]
Y. I. Hrushka, “On the order of convergence of a semigroup to the identity operator”,
Ukr. Mat. Zhurn.
, vol. 48, no. 6, pp. 847–851, Jun. 1996, Accessed: Apr. 13, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/5285