ARLINSKII, Yu. M. Operator-norm approximations of holomorphic one-parameter semigroups of contractions in Hilbert spaces. Methods of Functional Analysis and Topology, [S. l.], v. 18, n. 2, p. 101–110, 2012. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/508. Acesso em: 16 dec. 2025.