TY  - JOUR 
T1  - "Rio +20: what we can learn from the process and what is missing"
JO  - Cadernos EBAPE.BR
A1  - Oliveira, Jose A. Puppim de
SN  - 1679-3951
UL  - 10.1590/S1679-39512012000300003
VL  - 10 
Y1  - 2012
PB  - Brasil 
ER  -