@article{dueñas_martínez_ochoa_2008,  title={Z' production in 331 models},  volume={38},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332008000400008},  DOI={10.1590/S0103-97332008000400008},  number={3b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Dueñas, J. G. and Martínez, R. and Ochoa, F.},  year={2008},  month={Sep},  pages={421–424} }