@article{articlee457601b,
title   = {Microhardness of esthetic restorative materials at different depths},
author = {Palma Dibb, Regina Guenka and Palma, Alessandra Elias and Matson, Edmir and Chinelatti, Michelle Alexandra and Ramos, Renata Pereira},
year = {2003},
doi = {10.1590/s1516-14392003000100015},
journal   = {Materials Research}
}