Dhafer, W.A.-R., Kostyk, V., Kostyk, K., Glotka, A. and Chechel, M. 2016. The choice of the optimal temperature and time parameters of gas nitriding of steel. Eastern-European Journal of Enterprise Technologies. 3, 5(81) (Jun. 2016), 44–50. DOI:https://doi.org/10.15587/1729-4061.2016.69809.