@article{garcia_sotomayor_2003,  title={A metric property of umbilic points},  volume={75},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652003000400001},  DOI={10.1590/S0001-37652003000400001},  number={4},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={Garcia, Ronaldo and Sotomayor, Jorge},  year={2003},  month={Dec},  pages={405–413} }