Kakaš, Damir, Vladimir Bajić, Branko Škorić, and Leposava Šiđanin. 1989. “Investigation of the Influence of Austenitization Time on the Structure and Hardness of Untempered Ductile Iron”. Journal of Production Engineering 6 (5, 6):23-28. https://doi.org/10.24867/JPE-1989-06-023.