TY  - JOUR 
T1  - Erbium in a-Si:H
JO  - Brazilian Journal of Physics
A1  - Tessler, Leandro R.
SN  - 0103-9733
UL  - 10.1590/S0103-97331999000400003
VL  - 29 
Y1  - 1999
PB  - Brasil 
ER  -