Imuetinyan, Agho Timothy, and Archibong Ukeme Donatus. “Solvent Extraction of Bismuth (III) from Nitric Acid Solutions by Tri-N-Butyl Phosphate and Di (2-Ethylhexyl) Phosphoric Acid”. International Journal of Scientific Research in Chemical Sciences, vol. 10, no. 6, Dec. 2023, pp. 13-20, https://ijsrcs.isroset.org/index.php/j/article/view/145.