@article{ziegler_2015,  title={Introducción},  volume={26},  ISSN={0103-7307},  url={https://doi.org/10.1590/0103-7307201507701},  DOI={10.1590/0103-7307201507701},  number={2},  journal={Pro-Posições},  publisher={UNICAMP - Faculdade de Educação},  author={Ziegler, Sandra},  year={2015},  month={May},  pages={25–32} }