@article{Dorra_2016, title={Presentación}, volume={1}, url={https://topicosdelseminario.buap.mx/index.php/topsem/article/view/256}, DOI={10.35494/topsem.1999.1.1.256}, number={1}, journal={Tópicos del Seminario}, author={Dorra, Raúl}, year={2016}, month={mar.}, pages={5–7} }