ATHIRA, S. K.; KAMARAJ, K.; SAM JOHNSON, P. P. R. Algebraic Proofs of Characterizing Reverse Order Law for Closed Range Operators in Hilbert Spaces. Eurasian Mathematical Journal, [S. l.], v. 14, n. 3, p. 08–25, 2023. DOI: 10.32523/2077-9879-2023-14-3-08-25. Disponível em: https://emj.enu.kz/index.php/main/article/view/289. Acesso em: 21 sep. 2026.