“Sizing, Design, and Installation of an Isolated wind–photovoltaic Hybrid Power System With Battery Storage for Laboratory General Illumination in Afyonkarahisar, Turkey”. Journal of Energy in Southern Africa, vol. 26, no. 4, Apr. 2017, pp. 70-80, https://doi.org/10.17159/2413-3051/2015/v26i4a2113.