@article{Machicao Rossi_2003, title={Cinco pequeñas joyas}, volume={17}, url={https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10210}, number={34}, journal={Pro Mathematica}, author={Machicao Rossi, Marcelo}, year={2003}, month={sep.}, pages={195-213} }