Yamamoto, E. T. C., T. P. Sato, J. M. F. da Silva, A. L. S. Borges, and E. S. Uemura. “Retentive Force Comparison Between Esthetic and Metal Clasps for Removable Partial Denture”. Brazilian Dental Science, vol. 20, no. 3, Sept. 2017, pp. 87-92, doi:10.14295/bds.2017.v20i3.1431.