Alzghoul, Mohammad, Sarka Ferenc, and Szabó János Ferenc. “Optimization of Spindle System First Natural Frequency Values Using Response Surface Methodology and Analysis of Variance”. Eastern-European Journal of Enterprise Technologies 1, no. 1 (133) (February 5, 2025): 17–25. Accessed December 26, 2025. https://journals.uran.ua/eejet/article/view/320497.