Pérez de G. MA, Mejía de R. GI, Mejía J, Trujillo H. Role of group A beta-hemolytic streptococcus in children with chronic recurrent tonsillopharyngitis. Med UPB. 1989;8(2):141-149. Accessed June 4, 2026. https://revistas.upb.edu.co/index.php/medicina/article/view/5654