T. N. Simonova, V. A. Dubrovina, and A. B. Vishnikin, “Speciation of chromium through aqueous two-phase extraction of complexes of Cr(III) with 4-(2-pyridylazo)resorcinol and Cr(VI) with 1,5-diphenylcarbazide”, J. Serb. Chem. Soc., vol. 81, no. 6, pp. 645–659, Jul. 2016.