@article{aparecida dos santos de almeida_milan_edil da costa_2015,  title={Acquired Properties Comparison of Solid Nitriding, Gas Nitriding and
                    Plasma Nitriding in Tool Steels},  volume={18},  ISSN={1516-1439},  url={https://doi.org/10.1590/1516-1439.255513},  DOI={10.1590/1516-1439.255513},  number={1},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Aparecida dos Santos de Almeida, Elisangela and Milan, Júlio César Giubilei and Edil da Costa, César},  year={2015},  month={Jan},  pages={27–35} }