Alcota-Rojas, M., Compán-Catenacci, G., Salinas-Castro, J. C., & Palma-Eyzaguirre, A. M. (2011). Comparative in vitro study of root canal transportation, using three nickel-titanium rotary systems: hero shaper, protaper universal. Revista Facultad De Odontología Universidad De Antioquia, 23(1), 9–21. https://doi.org/10.17533/udea.rfo.8111