@article{moriconi_2022,  title={Elementary Solution of Kepler Problem (and a few other problems)},  volume={44},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2021-0365},  DOI={10.1590/1806-9126-RBEF-2021-0365},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Moriconi, M.},  year={2022},  pages={e20210365} }