KOROLEV, A. V. On the ergodic theorem in the Kozlov–Treshchev form for an operator semigroup. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 5, p. 702–707, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2901. Acesso em: 5 dec. 2025.