@article{ferreras_2012,  title={Apresentação},  volume={18},  ISSN={1413-7704},  url={https://doi.org/10.1590/S1413-77042012000200001},  DOI={10.1590/S1413-77042012000200001},  number={33},  journal={Tempo},  publisher={EdUFF - Editora da UFF},  author={Ferreras, Norberto Osvaldo},  year={2012},  pages={13–21} }