“Analysis of the Surface of Healthy and Fluorotic Human Enamel Using Microhardness Test”. Superficies y Vacío 30, no. 1 (March 15, 2017): 6–9. Accessed April 4, 2025. https://superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/2017_syv30_1-010006.