@article{accioly_azeredo_rey neto_mukai_1998,  title={Bending of light in the framework of R + R2 gravity},  volume={28},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331998000400025},  DOI={10.1590/S0103-97331998000400025},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Accioly, A. and Azeredo, A.D. and Rey Neto, E.C. de and Mukai, H.},  year={1998},  month={Dec},  pages={496–504} }