Radev, Hristo, Hristo Yakimov, and Irina Aleksandrova. “INVESTIGATION AND MODELLING OF SURFACE ROUGHNESS DURING MILLING OF GJL-250 GRAY CAST IRON AND S235JR STEEL USING MIXED CERAMIC TOOLS”. Proceedings of the International Conference on Secure Systems Design and Technology Development 2 (September 17, 2026): 235–241. Accessed September 27, 2026. https://journal.etrconf.eu/std/article/view/18.