Modu, B., M. P. Abdullah, A. L. Bukar, and M. Mustapha. “Supervisory Control of Solar-Wind-Biomass-Fuel Cell Energy System for Optimal Performance”. ELEKTRIKA- Journal of Electrical Engineering, vol. 22, no. 2, Aug. 2023, pp. 22-29, doi:10.11113/elektrika.v22n2.463.