@article{oliveira_damião soares_tonini_2005,  title={Nonlinear resonance in bouncing universes},  volume={35},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332005000700008},  DOI={10.1590/S0103-97332005000700008},  number={4b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Oliveira, H. P. de and Damião Soares, I. and Tonini, E. V.},  year={2005},  month={Dec},  pages={1050–1051} }