O.S. Fatoba, M.A. Bodude, O.L. Akanji, I.O. Adamson and S.C. Agwuncha 2021. The Suitability of Seashell, Animal Bone and Sodium Carbonate as Energizers in Case Carburization of Mild Steel. Journal of Basic & Applied Sciences. 9, (Oct. 2021), 578–586. DOI:https://doi.org/10.6000/1927-5129.2013.09.74.