@article{câmara_2005,  title={Invariants of germs of analytic differential equations in the complex plane},  volume={77},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652005000100001},  DOI={10.1590/S0001-37652005000100001},  number={1},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={Câmara, Leonardo M.},  year={2005},  month={Mar},  pages={1–11} }