G. Starzyński and W. Gambin, “Yield Stress Distribution in the Natural Surface Layer of Polycrystals”, Eng. Trans., vol. 44, no. 2, pp. 143–156, Jul. 1996, Accessed: Jan. 17, 2026. [Online]. Available: http://et.ippt.gov.pl/index.php/et/article/view/1455