@article{sodré jr._2005,  title={Light on dark matter: gravitational lensing by galaxy clusters},  volume={35},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332005000700041},  DOI={10.1590/S0103-97332005000700041},  number={4b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Sodré Jr., Laerte},  year={2005},  month={Dec},  pages={1155–1158} }