@article{nunokawa_2000,  title={Neutrino mass, mixing and oscillations},  volume={30},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332000000200015},  DOI={10.1590/S0103-97332000000200015},  number={2},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Nunokawa, Hiroshi},  year={2000},  month={Jun},  pages={346–356} }