Ha, N. T., P. D. Long, N. T. Trung, and L. V. Hong. “Graphene Effect on Efficiency of TiO2-Based Dye Sensitized Solar Cells (DSSC)”. Communications in Physics, vol. 26, no. 1, July 2016, p. 43, doi:10.15625/0868-3166/26/1/7961.