1. Renewables 2015 Global Status Report – Key Findings,8(2015) REN21
2. Cells Q, Retrieved from https://www.q-cells.com/products/technology.html
3. Ibarra-Castanedo C., Bendada A., and Maldague X. P. V,5th Pan American Conference for NDT, (2011).
4. Mathworks Retrieved from http://www.mathworks.com/help/stats/k-means-clustering.html#brah7f_-1.