KOCHUBEI, A. N. Non-Archimedean unitary operators. Methods of Functional Analysis and Topology, [S. l.], v. 17, n. 3, p. 219–224, 2011. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/487. Acesso em: 16 dec. 2025.