@article{article8b090b71,
title   = {Rare-earth impurities in gallium nitride: the role of the Hubbard potential},
author = {Caroena, Glaura and Machado, Wanda Valle Marcondes and Assali, Lucy Vitoria Credidio and Justo Filho, João Francisco},
year = {2012},
doi = {10.1016/j.diamond.2012.06.001},
journal   = {Diamond and Related Materials}
}