Lazov, Lyubomir, Nikolay Todorov Dolchinkov, Jordan Shterev Ivanov, Madlen Nikolaeva Peneva, and Denitsa Angelova Bojhanova. “STUDY OF LASER CUTTING AND MARKING ON THE FILT WITH THE HELP OF A CO2-LASER”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 143–147. Accessed May 6, 2024. https://journals.ru.lv/index.php/ETR/article/view/4202.