MWANZIA, J. M.; KAVILA, M.; KHALAGAI, J. On Fuglede – Putnam Theorems for Moore-Penrose Invertible Operators on Hilbert Spaces. African Journal of Pure and Applied Sciences, Nairobi, Kenya, v. 4, n. 1, p. 42–49, 2023. Disponível em: https://journal.ku.ac.ke/index.php/AJPAS/article/view/372. Acesso em: 12 feb. 2025.