@article{silva_silva_2006,  title={Foreword},  volume={36},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332006000300001},  DOI={10.1590/S0103-97332006000300001},  number={2a},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Silva, Erasmo A. de Andrada e and Silva, Antonio José Roque da},  year={2006},  month={Jun},  pages={1–1} }