Radev, Hristo, Hristo Yakimov, and Irina Aleksandrova. 2026. “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): 235-41. https://doi.org/10.68302/std2026.vol2.18.