TKACHENKO, I.; KOBZAR, Y. L.; Shekera О.; SHEVCHENKO, V. Synthesis of 4,4′-bis(nonafluorobiphenyl-4-oxyphenyl)-bis(trifluoromethyl)methane and a ladder polyether with spirobisindane fragments on its base . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 7, p. 116–122, 2025. DOI: 10.15407/dopovidi2015.07.116. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/15131. Acesso em: 13 aug. 2025.