Dimitra Sygkridou and  Dimitrios Karageorgopoulos and  Elias Stathatos and  Evangelos Vitoratos,  Comparison of Transparent Nickel Doped Cobalt Sulfide and Platinum Counter Electrodes Used in Quasi-Solid State Dye Sensitized Solar Cells.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 102(6). 606 - 611
    [viewed 05 May 2021]. Available from: https://publications.waset.org/pdf/10002077.