TY  - JOUR 
T1  - Panic disorder and the respiratory system: clinical subtype and challenge tests
JO  - Brazilian Journal of Psychiatry
A1  - Freire, Rafael C.
A1  - Nardi, Antonio E.
SN  - 1516-4446
UL  - 10.1590/S1516-44462012000500004
VL  - 34 
Y1  - 2012
PB  - Brasil 
ER  -