Optimal tilt angle for photovoltaic panels in the Algerian region of El-Oued in the spring season: An experimental studyMokhtar Ghodbane, Soulef Largot, Noureddine Bessous, Boussad Boumeddane, Rania Zhar, Khadija LahrechInternational Journal of EnergeticaVolume 8، (1)، Pages 242023Article Open accessSeveral sources