TY  - JOUR 
T1  - Positive, negative and marker-free strategies for transgenic plant selection
JO  - Brazilian Journal of Plant Physiology
A1  - Aragão, Francisco José Lima
A1  - Brasileiro, Ana Cristina Miranda
SN  - 1677-0420
UL  - 10.1590/S1677-04202002000100001
VL  - 14 
Y1  - 2002
PB  - Brasil 
ER  -