TY - JOUR AU - Torres Velasco, Javier PY - 2010/11/11 Y2 - 2024/03/28 TI - PresentaciĆ³n JF - Opera JA - OPE VL - 10 IS - 10 SE - PresentaciĆ³n DO - UR - https://revistas.uexternado.edu.co/index.php/opera/article/view/3095 SP - 1-4 AB - <html /> ER -