@article{article337b7631,
title   = {In vitro study on radiographic gray levels of biomaterials using two digital image methods},
author = {Nóbrega, Newton Fernando Sobreira and Puchnick, Andrea and Cerqueira, Leandro Kfouri Martins and Costa, Claudio and Ajzen, Sérgio},
year = {2012},
doi = {10.1590/s1980-65232012000300008},
journal   = {Revista Odonto Ciência}
}