K. Sharma, U. Maroo, R. Chauhan, A. Goswami, and D. Purohit, “Use of 3-Hydroxy-3-Phenyl-1-m-Hydroxyphenyltriazene in the Spectrophotometric Determination of Cobalt(II)”, ajc, vol. 11, no. 3, pp. 1067–1068, Mar. 2010.