Betancur-P., John Jairo, Álvaro Carvajal-F., Pedro María Jaramillo-V., Jenny García-B., Nora Madrigal-M., and Margarita Lopera-A. “Comparative Study of the Clinical Effect Produced by the First Class® and the Pendulum in Patients Trated at the College of Dentistry, University of Antioquia: A Radiographic and Model Analysis”. Revista Facultad de Odontología Universidad de Antioquia 18, no. 2 (November 6, 2009): 29–44. Accessed April 5, 2025. https://revistas.udea.edu.co/index.php/odont/article/view/2760.