Frames and operators on quaternionic Hilbert spaces. Uzbek Mathematical Journal, [S. l.], v. 70, n. 2, p. 121–135, 2026. DOI: 10.29229/uzmj.2026-2-15. Disponível em: https://uzmj.mathinst.uz/index.php/uzmj/article/view/403.. Acesso em: 13 jun. 2026.