@article{dos santos_santos_costa_2013,  title={Pressure Influence on the Stability and Formation of γ - Fe4N when Transformed into Fe4O},  volume={16},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14392013005000118},  DOI={10.1590/S1516-14392013005000118},  number={6},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={dos Santos, A. V. and Santos, J. V. and Costa, Marcos A.},  year={2013},  month={Nov},  pages={1260–1265} }