Samuel Oluwatobi, Matthew, et al. “Determination of Yearly Performance and Degradation Rate of Electrical Parameters of Amorphous Silicon Photovoltaic Module in Minna, Nigeria”. International Journal of Physical Research, vol. 10, no. 1, Jan. 2022, pp. 18-32, https://doi.org/10.14419/ijpr.v10i1.31882.