Saddam Al-Otab, Salman Ajib, & Wolfgang Langner. (2018). A Comparative Investigation on Outdoor and Laboratory Test of the Degradation Rates for Different Types of Photovoltaic Modules with Different Exposure Periods. Global Journal of Energy Technology Research Updates, 5(1), 56–71. https://doi.org/10.15377/2409-5818.2018.05.6