TY  - JOUR 
T1  - Smoking as a risk factor for periodontitis: a literature review
JO  - Revista Odonto Ciência
A1  - Shaju, Jacob P
SN  - 1980-6523
UL  - 10.1590/S1980-65232010000400016
VL  - 25 
Y1  - 2010
PB  - Brasil 
ER  -