R. Yankova, D. Mincheva, P. Petrov, and D. Veselinov, “Study of the Influence of Low-temperature Nitrocarburizing on the Wear Rate of Sintered Low-alloy Powder Steels”, C. R. Acad. Bulg. Sci., vol. 78, no. 7, pp. 983–990, Jul. 2025.