Nwigwe, S. U., R. Umunakwe, S. O. Mbam, M. Yibowei, K. Okon, and G. Kalu-Uka. “The Inhibition of Carica Papaya Leaves Extract on the Corrosion of Cold Worked and Annealed Mild Steel in HCl and NaOH Solutions Using a Weight Loss Technique”. Engineering and Applied Science Research, vol. 46, no. 2, June 2019, pp. 114-9, https://ph01.tci-thaijo.org/index.php/easr/article/view/151118.