Lazov, L., Padarev, N., Yovchev, M., & Linkov, L. (2024). THE CHANGE OF CONTRAST IS INVESTIGATION OF 75 STEEL SAMPLES LASER MARKED WITH DIFFERENT MODES. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, 3, 334-338. https://doi.org/10.17770/etr2023vol3.7264