Karim, N. H., AI- Nuaimi, S., & Nassory, N. S. (2017). Potentiometric Analysis of Samarium Ion in Aqueous Solution Employing Selective Electrode Based on Crown Ethers - Samarium Picrate Complexes in a PVC Membrane. Ibn AL-Haitham Journal For Pure and Applied Sciences, 19(3), 117-133A. https://jih.uobaghdad.edu.iq/index.php/j/article/view/1653