Tkachenko I. М.; Kobzar, Y. L.; Kravchenko, V. V.; Shekera О. V.; Shevchenko, V. V. Synthesis of 4,4′-bis(nonafluorobiphenyl-4-Oxyphenyl)- 1,4-Oxytetrafluorobenzene and Ladder Spirobisindane-Containing Polyether on Its Base. Dopov. Nac. akad. nauk Ukr. 2024, 100-106.