Igavens, Andris, Jānis Riekstiņš, Artūrs Sivenkovs, Ļubomirs Lazovs, and Pāvels Narica. “DIODE PUMPED YTTERBIUM FIBER LASER MARKING PROCESS PARAMETER IMPACT ON MARK QUALITY OF POLIVINILCHLORIDE (PVC) MATERIAL”. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, no. 20 (April 20, 2016): 91–100. Accessed May 3, 2024. https://journals.rta.lv/index.php/HET/article/view/3496.