@article{articleed59b4c4,
title   = {Impurity levels of substitutional chalcogens-doped ge},
author = {Castineira, J L P and Scolfaro, L M R and Leite, J. R.},
year = {1991},
doi = {10.1016/0038-1098(91)90909-f},
journal   = {Solid State Communications}
}