@inproceedings{inproceedings1276b36e,
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},
publisher = {SBF},
booktitle   = {Encontro Nacional de Física da Matéria Condensada}
}