M. A. Pérez de G., G. I. . Mejía de R., J. Mejía, and H. Trujillo, “Role of group A beta-hemolytic streptococcus in children with chronic recurrent tonsillopharyngitis”, Med UPB, vol. 8, no. 2, pp. 141–149, Dec. 1989, Accessed: Jun. 04, 2026. [Online]. Available: https://revistas.upb.edu.co/index.php/medicina/article/view/5654