TY  - JOUR 
T1  - Material void fraction evaluation with mixed neutron beams: theory and numerical experiment
JO  - Matéria (Rio de Janeiro)
A1  - Abreu, M.P. de
SN  - 1517-7076
UL  - 10.1590/S1517-70762009000100006
VL  - 14 
Y1  - 2009
PB  - Brasil 
ER  -