Georgiev, Kliment, and Pavlina Katsarova. “COMPARATIVE ANALYSIS OF THE RESULTSOF AN EXPERIMENTAL STUDY WITH BASIC EQUIPMENT AND A SPECIALLY MADE ONE TOTHE INSIZE ISR - C002 ROUGHNESS TESTER”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 22, 2024): 58–64. Accessed July 18, 2024. https://journals.ru.lv/index.php/ETR/article/view/8106.