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Sygkridou, D. , Karageorgopoulos, D. , Stathatos, E. , Vitoratos, E.. "Comparison of Transparent Nickel Doped Cobalt Sulfide and Platinum Counter Electrodes Used in Quasi-Solid State Dye Sensitized Solar Cells". World Academy of Science, Engineering and Technology, Open Science Index 102, International Journal of Electrical and Computer Engineering (2015), 9(6), 606 - 611.