@article{correa_cardoso_carvalho_2025,  title={Small oscillations study of a nonlinear circular oscillator},  volume={47},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2025-0233},  DOI={10.1590/1806-9126-RBEF-2025-0233},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Correa, Eberth and Cardoso, Leandro Xavier and Carvalho, Lindomar Bomfim},  year={2025},  pages={e20250233} }