Oreko, Benjamin Ufuoma, et al. “Experimental Investigation of the Effect of Pack Carburization on Impact Strength and Hardness Property of ASTM A516 516M-05 Steel Plate Weldment”. International Journal of Integrated Engineering, vol. 12, no. 1, Jan. 2020, pp. 115-21, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/3688.