@article{vainsencher_xavier_2004,  title={Numbers for reducible cubic scrolls},  volume={76},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652004000400003},  DOI={10.1590/S0001-37652004000400003},  number={4},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={Vainsencher, Israel and Xavier, Fernando},  year={2004},  month={Dec},  pages={645–650} }