TY  - JOUR 
T1  - Topological charge screening and pseudoscalar glueballs
JO  - Brazilian Journal of Physics
A1  - Forkel, Hilmar
SN  - 0103-9733
UL  - 10.1590/S0103-97332004000500045
VL  - 34 
Y1  - 2004
PB  - Brasil 
ER  -