@article{vanini_shahba_kordani_2014,  title={Numerical investigation of sliding frictional contact in functionally graded steels (FGS)},  volume={17},  ISSN={1516-1439},  url={https://doi.org/10.1590/1516-1439.204713},  DOI={10.1590/1516-1439.204713},  number={6},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Vanini, Seyed Ali Sadough and Shahba, Mohamad and Kordani, Naser},  year={2014},  month={Nov},  pages={1477–1484} }