V. Kumar Yadav, K. Kumar Paliwal, S. Kumar, B. Kishore Gupta, A. Goswami, and D. Purohit, “Complexmetric Determination of Chromium(III) from Binary and Ternary Metal Ion Mixture Using 3-Hydroxy-3-p-Nitrophenyltriazene ”, ajc, vol. 12, no. 3, pp. 890–892, Mar. 2010.