Brovkin, Y. N., S. V. Plaksin, A. Y. Podchasov, L. M. Pogorelaya, and Y. V. Shkil. “INCREASE OF EFFICIENCY OF PHOTOELECTRIC ENERGY INSTALLATION OPERATION”. Electrical Engineering and Power Engineering, no. 2, Jan. 2008, https://ee.zp.edu.ua/article/view/102895.