RESEARCH OF THE SURFACE ROUGHNESS DURING HARD TURNING OF 42CRMOS4 STEEL WITH A QUICK-CHANGE TOOL HOLDER. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 4, p. 151–155, 2025. DOI: 10.17770/etr2025vol4.8437. Disponível em: https://archive-journals.rtu.lv/etr/article/view/5237.. Acesso em: 11 mar. 2026.