TY  - JOUR 
T1  - Cosmology and gravitation
JO  - Brazilian Journal of Physics
A1  - Maia, M. D.
SN  - 0103-9733
UL  - 10.1590/S0103-97332004000700022
VL  - 34 
Y1  - 2004
PB  - Brasil 
ER  -