@article{schettini_azzoni_2018,  title={Productive efficiency and the future of regional disparities in Brazil},  volume={28},  ISSN={0103-6351},  url={https://doi.org/10.1590/0103-6351/4195},  DOI={10.1590/0103-6351/4195},  number={2},  journal={Nova Economia},  publisher={Nova Economia},  author={Schettini, Daniela and Azzoni, Carlos Roberto},  year={2018},  month={May},  pages={347–379} }