GUPTA, O.D. “Determination of Stability Constants of Ternary Complexes of Lead With Vitamin B5 and Amino Acids (L-Citrulline and Valine) Polarographycally”. Asian Journal of Chemistry, vol. 21, no. 6, Mar. 2010, pp. 4658-62, https://asianpubs.org/index.php/ajchem/article/view/18215.