@article{guinsburg_2008,  title={Círculos concêntricos},  volume={26},  ISSN={0103-0582},  url={https://doi.org/10.1590/S0103-05822008000200001},  DOI={10.1590/S0103-05822008000200001},  number={2},  journal={Revista Paulista de Pediatria},  publisher={Sociedade de Pediatria de São Paulo},  author={Guinsburg, Ruth},  year={2008},  month={Jun},  pages={104–105} }