@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={Sept}, pages={319–326} }