@article{tavares_leonel_2008,  title={A simplified Fermi Accelerator Model under quadratic frictional force},  volume={38},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332008000100011},  DOI={10.1590/S0103-97332008000100011},  number={1},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Tavares, Danila F. and Leonel, Edson D.},  year={2008},  month={Mar},  pages={58–61} }