Cruz Ramírez, Alejandro. 2019. “The Effect of Casting Modulus in Hypo-Eutectic Ductile Iron Unalloyed and Alloyed With Nickel on Microstructure and Mechanical Properties”. Journal of Mining and Metallurgy, Section B: Metallurgy 55 (2), 283. https://aseestant.ceon.rs/index.php/jmm/article/view/19150.