@article{2001,  title={XXIst Brazilian National Meeting on Particles and Fields: FOREWORD},  volume={31},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332001000200001},  DOI={10.1590/S0103-97332001000200001},  number={2},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  year={2001},  month={Jun},  pages={111–114} }