“PENINGKATAN KEKERASAN PERMUKAAN FERRO CASTING DUCTILE (FCD) 700 MELALUI PROSES NITRIDASI DENGAN MEDIA UREA”. Creative Research Journal 1, no. 01 (June 30, 2015): 64–78. Accessed July 4, 2026. https://crjournal.jabarprov.go.id/index.php/crj/article/view/74.