Vidal, Jorge Eugenio. «Research on the Biology of the Pneumococcus and Pneumococcal Diseases: The Number One Cause of Death in Children Worldwide». Horizonte Sanitario 16, no. 1 (enero 16, 2017): 5–7. Accedido octubre 4, 2025. https://revistahorizonte.ujat.mx/horizonte/article/view/1518.