@article{marcondes_ueda_kostov_beloto_leite_gomes_lepienski_2004,  title={Improvements of ultra-high molecular weight polyethylene mechanical properties by nitrogen plasma immersion ion implantation},  volume={34},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332004000800029},  DOI={10.1590/S0103-97332004000800029},  number={4b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Marcondes, A. R. and Ueda, M. and Kostov, K. G. and Beloto, A. F. and Leite, N. F. and Gomes, G. F. and Lepienski, C. M.},  year={2004},  month={Dec},  pages={1667–1672} }