TY  - JOUR 
T1  - Influence of wearing time on efficacy of disposable surgical masks as microbial barrier
JO  - Brazilian Journal of Microbiology
A1  - Barbosa, Maria Helena
A1  - Graziano, Kazuko Uchikawa
SN  - 1517-8382
UL  - 10.1590/S1517-83822006000300003
VL  - 37 
Y1  - 2006
PB  - Brasil 
ER  -