@article{kock_2001,  title={Tangency quantum cohomology and characteristic numbers},  volume={73},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652001000300002},  DOI={10.1590/S0001-37652001000300002},  number={3},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={KOCK, JOACHIM},  year={2001},  month={Sep},  pages={319–326} }