Murillo, Margarita, Augusto R. Elías-Boneta, Omar García-Rodríguez, and Milagros J. Toro. 2020. “Comparison of Chu’s Proportion Gauge With a T-Bar Tip and a Two-Tip Compass in the Determination of Anterior Dentition Tooth Size in a Group of Puerto Ricans”. Puerto Rico Health Sciences Journal 39 (4):288-93. https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/1749.