“SYNTHESIS AND PHOTOVOLTAIC PROPERTIES OF SYMMETRIC BIS-AZOMETHINES WITH ACCEPTOR SUBSTITUENTS IN THE 4,4’-POSITION: DOI: Https: doi.Org 10.17721 1728-2209.2019.1(56).9”. 2019. Bulletin of Taras Shevchenko National University of Kyiv. Chemistry 56 (1): 36-39. https://chemistry.bulletin.knu.ua/en/article/view/8366.