O. Kovalchukova, M. Ryabov, A. Obmenennaya, and N. Popandopulo, “The Spectroscopic and theoretical investigations of complex formation of (3E,3’E)-7,7’-(carbonylbis(azanediyl))bis(3-(2-(2-hydroxyphenyl)hydrazono)-4-oxo-3,4-dihydronaphthalene-2-sulfonic acid) with metal cations”, JAC, vol. 15, no. 2, pp. 6207–6217, Jul. 2018.