@article{Vélez Ramírez_2009, title={Presentación}, url={https://personaybioetica.unisabana.edu.co/index.php/personaybioetica/article/view/624}, number={4}, journal={Persona y Bioética}, author={Vélez Ramírez, Amparo}, year={2009}, month={jul.}, pages={IX-X} }