Bergonzoli, Gustavo. “¿La Razón De Mortalidad Proporcional, Cuán Válida Es?.”. Colombia Médica 30, no. 3 (1): 132-137. Accessed June 8, 2025. https://colombiamedica.univalle.edu.co/colombiamedica311/index.php/comedica/article/view/136.