TY  - JOUR 
T1  - Strain and sex differences in fear conditioning: 22 kHz ultrasonic vocalizations and freezing in rats
JO  - Psychology & Neuroscience
A1  - Graham, Lauren K.
A1  - Yoon, Taejib
A1  - Lee, Hongjoo J.
A1  - Kim, Jeansok J.
SN  - 1983-3288
UL  - 10.3922/j.psns.2009.2.015
VL  - 2 
Y1  - 2009
PB  - Brasil 
ER  -