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\bibitem{Khalil-Allafi+Amin-Ahmadi2011} {\textquotedblleft}\textit{Influence of mold preheating and silicon content on microstructure and casting properties of ductile iron in permanent mold}{\textquotedblright}. Khalil-Allafi J, Amin-Ahmadi B, Journal of iron and steel research international \textbf{18}, 34 (2011).   http://doi.org/10.1016/S1006-706X(11)60034-4

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