@article{article680e57e0,
title   = {Intra-d excitations: comparison between aproaches for impurities in semiconductors},
author = {Makiuchi, N and Fazzio, Adalberto and Canuto, Sylvio Roberto Accioly},
year = {1988},
doi = {10.1103/physrevb.37.4770},
journal   = {Physical Review B}
}