TY  - JOUR 
T1  - Letter from the Guest Editor
JO  - Journal of the Brazilian Computer Society
A1  - Osório, Fernando Santos
A1  - Fernando, Denis
A1  - Alsina, Wolf Pablo Javier
SN  - 0104-6500
UL  - 10.1590/S0104-65002009000300001
VL  - 15 
Y1  - 2009
PB  - Brasil 
ER  -