ISMAEEL, A.R., et al. “Effect of Heat Treatment (Ferritizing) on Chemical Composition, Microstructure, Physical Properties and Corrosion Behaviour of Spheroidal Ductile Cast Iron”. Asian Journal of Chemistry, vol. 19, no. 6, Mar. 2010, pp. 4665-73, https://asianpubs.org/index.php/ajchem/article/view/19983.