@article{articled3b439b5,
title   = {Cross-Sectional hardness of enamel from human teeth at different posteruptive ages},
author = {Cardoso, C. A. B. and Magalhães, Ana Carolina and Rios, Daniela and Lima, José Eduardo de Oliveira},
year = {2009},
doi = {10.1159/000264687},
journal   = {Caries Research}
}