“Extraction Equilibrium of Ni(II) in the Ni2+-SO42--Ac-(Na+, H+) - Cyanex 272 (H2A2)-kerosene-3%(v/v) Octan-1-ol System” (2011) Journal of Scientific Research, 4(1), p. 83. doi:10.3329/jsr.v4i1.8007.