TY  - JOUR 
T1  - Foreword
JO  - Brazilian Journal of Physics
A1  - Silva, Erasmo A. de Andrada e
A1  - Silva, Antonio José Roque da
SN  - 0103-9733
UL  - 10.1590/S0103-97332006000300001
VL  - 36 
Y1  - 2006
PB  - Brazil 
ER  -