@article{braghin_2007,  title={Linear sigma model at finite baryonic density and symmetry breakings},  volume={37},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332007000100012},  DOI={10.1590/S0103-97332007000100012},  number={1a},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Braghin, F. L.},  year={2007},  month={Mar},  pages={33–36} }