“Spectrophotometric Determination of Co(II) in Vitamin B12 Using 2-(biphenyl-4-yl)-3-((2-(2,4-dinitrophenyl) hydrazono)methyl) imidazo [1,2-a]pyridine as Ligand by Flow Injection–Merging Zone Analysis”, ANJS, vol. 23, no. 3, pp. 24–38, Sep. 2020, Accessed: Jul. 22, 2024. [Online]. Available: https://anjs.edu.iq/index.php/anjs/article/view/2309