Mwanzia, J. M., M. Kavila, and J. Khalagai. 2023. “On Fuglede – Putnam Theorems for Moore-Penrose Invertible Operators on Hilbert Spaces”. African Journal of Pure and Applied Sciences 4 (1). Nairobi, Kenya:42-49. https://doi.org/10.33886/ajpas.v4i1.372.