METHODOLOGY FOR AUTOMATIC DETERMINATION OF CONTRAST OF LASER MARKING FOR DIFFERENT MATERIALS. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 3, p. 134–136, 2019. DOI: 10.17770/etr2019vol3.4143. Disponível em: https://archive-journals.rtu.lv/etr/article/view/4352.. Acesso em: 11 mar. 2026.