Pérez de G. MA, Trujillo Soto H. Effectiveness of the estolate of erythromycin, ampicillin, and cefachlor in group A streptococcal tonsillopharyngitis. Med UPB. 1983;2(2):49-52. Accessed August 11, 2026. https://revistas.upb.edu.co/index.php/medicina/article/view/6453