INCREASING THE EFFECIENCY OF LASER MARKING OFALUMINUM ALLOYS BY DOUBLE WRITING OF THE SYMBOLS. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 3, p. 20–24, 2021. DOI: 10.17770/etr2021vol3.6550. Disponível em: https://archive-journals.rtu.lv/etr/article/view/4515.. Acesso em: 11 mar. 2026.