Laayouj, N., H. Jamouli, and M. El Hail. “Intelligent Prognostic Framework for Degradation Assessment and Remaining Useful Life Estimation of Photovoltaic Module”. Journal of Engineering and Technological Sciences, vol. 48, no. 6, Dec. 2016, pp. 772-95, doi:10.5614/j.eng.technol.sci.2016.48.6.9.