Adekunle, A.S., K.A. Adebiyi, and M.O. Durowoju. 2013. “Impact of Quench Severity and Hardness on AISI 4137 Using Eco-Friendly Quenchants As Industrial Heat Treatment”. Journal of Mechanical Engineering and Sciences 4 (1):409-17. https://doi.org/10.15282/jmes.4.2013.5.0038.