@misc{ferkel_rf_nitriding_2003, 
author={Ferkel, H.,Estrin, J.,Blawert, C.,Valiev, R.Z.},
title={RF nitriding of serverely deformed Armco iron and St2K50},
year={2003},
howpublished = {journal article},
doi = {https://doi.org/10.1016/S0257-8972(03)00451-1},
note = {Online available at: \url{https://doi.org/10.1016/S0257-8972(03)00451-1} (DOI). Ferkel, H.; Estrin, J.; Blawert, C.; Valiev, R.: RF nitriding of serverely deformed Armco iron and St2K50. Surface and Coatings Technology. 2003. vol. 173-174, 1164-1170. DOI: 10.1016/S0257-8972(03)00451-1}}