1. 1. A. S. Shirinyan and V. A. Makara, Nanosistemi, Nanomateriali, Nanotehnologii, 8, No. 2: 223 (2010) (in Ukrainian).
2. 2. D. Sengupta, P. Das, B. Mondal, and K. Mukherjee, Renewable and Sustainable Energy Reviews, 60: 356 (2016).
3. https://doi.org/10.1016/j.rser.2016.01.104
4. 3. L. L. Odyinets, Anodnyye Oksidnyye Plyonki (Leningrad: Nauka: 1990) (in Russian).
5. 4. B. I. Bayrachnyiy and F. K. Andryuschenko, Ehlektrokhimiya Ventilnykh Metallov (Kharkov: Vyshcha Shkola: 1985) (in Russian).