Rajagukguk, Kardo, and Suyito. “Effect of Pattern Coating Thickness on Surface Roughness and Porosity of Nodular Cast Iron (FCD) 450 Using Lost Foam Casting Method”. Cylinder : Jurnal Ilmiah Teknik Mesin 4, no. 1 (October 15, 2018): 7–13. Accessed July 3, 2024. https://ejournal.atmajaya.ac.id/index.php/cylinder/article/view/4193.