TY  - JOUR 
T1  - A review of analytical methods for the determination of four new phosphodiesterase type 5 inhibitors in biological samples and pharmaceutical preparations
JO  - Brazilian Journal of Pharmaceutical Sciences
A1  - Codevilla, Cristiane Franco
A1  - Castilhos, Tamara dos Santos
A1  - Bergold, Ana Maria
SN  - 1984-8250
UL  - 10.1590/S1984-82502013000100002
VL  - 49 
Y1  - 2013
PB  - Brasil 
ER  -