S.Sivakumar, A.Sahaya Raja, J.Sathiyabama, and V.Prathipa. “Spectroscopic Methods Used for Analyzing Protective Film Formed by L-Histidine on Carbon Steel”. International Journal of Pharmaceutics and Drug Analysis, vol. 2, no. 7, July 2014, pp. 601-1, https://ijpda.org/index.php/journal/article/view/86.