M. RAMESWARA RAO, K. HARI, N. DEVANNA, and K. CHANDRASEKHAR, “Derivative Spectrophotometric Determination of Uranium(VI) using 2-Hydroxy-3-methoxybenzaldehydeisonicotinoylhydrazone Reagent”, ajc, vol. 20, no. 2, pp. 1402–1410, Mar. 2010.