Design and Simulation Studies of Hybrid Power Systems Based on Photovoltaic, Wind, Electrolyzer, and PEM Fuel Cells oleh Hussein A.Z. AL-bonsrulah, Mohammed J. Alshukri, Lama M. Mikhaeel, Noor N. AL-sawaf, Kefif Nesrine, M.V. Reddy, Karim Zaghib