@article{oliveira_2012,  title={Exchange rate exposure of firms and the demand for foreign exchange derivatives in Brazil: did hedge or speculatiom matter?},  volume={16},  ISSN={1413-8050},  url={https://doi.org/10.1590/S1413-80502012000400004},  DOI={10.1590/S1413-80502012000400004},  number={4},  journal={Economia Aplicada},  publisher={Faculdade de Economia, Administração e Contabilidade de Ribeirão Preto da Universidade de São Paulo},  author={Oliveira, Fernando Nascimento de},  year={2012},  month={Oct},  pages={613–641} }