Biswas, R. K., A. K. Karmakar, and M. S. Rahman. “Extraction Equilibrium of Ni(II) in the Ni<sup>2+</sup>-SO<sub>4</sub><sup>2-</sup>-Ac<sup>-</sup>(Na<sup>+</sup>, H<sup>+</sup>) - Cyanex 272 (H<sub>2</sub>A<sub>2</sub>)-Kerosene-3%(v/V) Octan-1-Ol System”. Journal of Scientific Research, vol. 4, no. 1, Dec. 2011, p. 83, doi:10.3329/jsr.v4i1.8007.