@article{hawking_2009,  title={A fronteira final},  ISSN={0101-3300},  url={https://doi.org/10.1590/S0101-33002009000100013},  DOI={10.1590/S0101-33002009000100013},  number={83},  journal={Novos estudos CEBRAP},  publisher={Centro Brasileiro de Análise e Planejamento},  author={Hawking, Stephen},  year={2009},  month={Mar},  pages={211–216} }