P. U. Chimah, P. B. Otah, P. I. Akande, G. C. Nwigwe, N. Okporie-Brown, and P. O. Ike, “The Effect of Dopants on the Solid State and Optical Parameters of TiO2 / MgO Thin Film”, NJP, vol. 35, no. 4, pp. 323–328, Aug. 2026, doi: 10.62292/njp.v35i4.2026.696.