@article{article09f27d15,
title   = {Evaluation of dental shade guide variability using cross-polarized photography},
author = {Gurrea, Jon and Gurrea, Marta and Bruguera, August and Sampaio, Camila S. and Janal, Malvin and Bonfante, Estevam Augusto and Coelho, Paulo G. and Hirata, Ronaldo},
year = {2016},
doi = {10.11607/prd.2700},
journal   = {The International Journal of Periodontics & Restorative Dentistry}
}