Widomski, P., Z. Gronostajski, M. Kaszuba, J. Kowalska, and M. Pawełczyk. “The Laboratory Tests of Hybrid Layers Combining Hardfacing and Nitriding Dedicated to Increase the Durability of Forging Tools in Hot Forging Processes”. Welding Technology Review, Vol. 91, no. 2, Feb. 2019, doi:10.26628/wtr.v91i2.1020.