@article{martínez_serna_2018,  title={Disparities at the entrance door: gender gaps in elementary school},  volume={44},  ISSN={1517-9702},  url={https://doi.org/10.1590/S1678-4634201844184081},  DOI={10.1590/S1678-4634201844184081},  journal={Educação e Pesquisa},  publisher={Faculdade de Educação da Universidade de São Paulo},  author={Martínez, Lina and Serna, Natalia},  year={2018},  pages={e184081} }