@article{serra_1988,  title={ZPEs no Brasil: fora de tempo e lugar},  volume={8},  ISSN={0101-3157},  url={https://doi.org/10.1590/0101-31571988-4088},  DOI={10.1590/0101-31571988-4088},  number={4},  journal={Brazilian Journal of Political Economy},  publisher={Centro de Economia Política},  author={SERRA, JOSÉ},  year={1988},  month={Oct},  pages={580–599} }