Salisu, S., Mustafa, M. W., Mustapha, M., Otuoze, A. O. and Mohammed, O. O. (2019) “A Hybrid PSO-ANFIS Approach for Horizontal Solar Radiation Prediction in Nigeria”, ELEKTRIKA- Journal of Electrical Engineering, 18(2), pp. 23–32. doi: 10.11113/elektrika.v18n2.153.