Mathew, George, and M.L. Hari Kumaran Nair. “Synthesis, Spectral and Cyclic Voltammetric Studies of Some Ru(III) Complexes of Azo Dyes Derived from 4-Aminoantipyrine”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1875-80, https://asianpubs.org/index.php/ajchem/article/view/14426.