TY  - JOUR 
T1  - Importance of the control group in scientific research
JO  - Dental Press Journal of Orthodontics
A1  - Pithon, Matheus Melo
SN  - 2176-9451
UL  - 10.1590/S2176-94512013000600003
VL  - 18 
Y1  - 2013
PB  - Brasil 
ER  -