Mpheleki Lupiwana, Raymond Taziwa, Edson Meyer, and David Katwire, “Structural, Morphological, Topographical Characterization of Titanium Dioxide Nanotubes Metal Substrates for Solar Cell Application”, J. Mater. Sci. Technol. Res., vol. 3, no. 2, pp. 17–31, Nov. 2021.