1.
Analysis of the Hardness of AISI 4140 Steel Gears after Carbon Enrichment Using Coconut Shell Charcoal. TOFEDU [Internet]. 2026 Jul. 15 [cited 2026 Oct. 9];5(2):3996-4004. Available from: https://journal.tofedu.or.id/index.php/journal/article/view/2158