TY  - JOUR 
T1  - Exploring the global topology of the universe
JO  - Brazilian Journal of Physics
A1  - Fagundes, Helio V.
SN  - 0103-9733
UL  - 10.1590/S0103-97332002000500012
VL  - 32 
Y1  - 2002
PB  - Brazil 
ER  -