@article{guardia_2013,  title={Boletín de la Escuela Moderna},  volume={24},  ISSN={0103-7307},  url={https://doi.org/10.1590/S0103-73072013000200016},  DOI={10.1590/S0103-73072013000200016},  number={2},  journal={Pro-Posições},  publisher={UNICAMP - Faculdade de Educação},  author={Guardia, Francico Ferrer},  year={2013},  month={May},  pages={252–257} }