M. SHOUKRY, EMAN, ZINAB H. ABD EL-WAHAB, and REDA A. ALI. 2010. “Potentiometric Studies of Binary and Ternary Nickel(II) Complexes Involving Ethylenediamine-N,N&Acute; -Diacetic Acid, Amino Acids and Peptides ”. Asian Journal of Chemistry 15 (1):5-14. https://asianpubs.org/index.php/ajchem/article/view/21493.