@article{braga_2002,  title={Quantum fields in anti-de Sitter space and the Maldacena conjecture},  volume={32},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332002000500010},  DOI={10.1590/S0103-97332002000500010},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Braga, Nelson R. F.},  year={2002},  month={Dec},  pages={880–883} }