“Study of the Microstructure of 20 GL Steel Samples Cut From A WedgeShaped and Side Frame After Volumetric Surface Quenching”, Eura. Scie. Hera., vol. 9, pp. 76–81, Jun. 2022, Accessed: Jan. 21, 2026. [Online]. Available: https://geniusjournals.org/index.php/esh/article/view/1707