A. I. Kovalchuk, Ya. L. Kobzar, I. M. Tkachenko, A. L. Tolstov, O. V. Shekera, V. V. Shevchenko, “Synthesis and optical properties of new isomeric azo-containing bis(2-hydroxybenzaldehydes) with tetrafluorobenzene units”, Mendeleev Commun., 27:6 (2017), 599–601
