T. Vlakhov, Y. Marinov, G. Hadjichristov, and N. Scaramuzza, “Electrical Conductivity Properties of Solid Polymer Electrolytes PEO-PVP-NaIO4 Filled with TiO2 Nanoparticles”, C. R. Acad. Bulg. Sci. , vol. 75, no. 6, pp. 804–811, Jun. 2022.