@article{schäfer_1981,  title={Dívida externa brasileira: problema e perspectivas },  volume={1},  ISSN={0101-3157},  url={https://doi.org/10.1590/0101-31571981-4053},  DOI={10.1590/0101-31571981-4053},  number={4},  journal={Brazilian Journal of Political Economy},  publisher={Centro de Economia Política},  author={SCHÄFER, HANS-BERND},  year={1981},  month={Oct},  pages={440–456} }