@article{Vélez Ramírez_2009, title={Presentación}, url={https://personaybioetica.unisabana.edu.co/index.php/personaybioetica/article/view/632}, number={5}, journal={Persona y Bioética}, author={Vélez Ramírez, Amparo}, year={2009}, month={jul.}, pages={VII-IX} }