Mitev, Ivan, and Simeon Tsenkulovski. “LOCAL PROCESSING OF NON-METAL MATERIALS WITH CONCENTRATED ENERGY FLOW”.
ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (January 16, 2024): 183–186. Accessed May 1, 2025.
https://journals.ru.lv/index.php/ETR/article/view/7275.