Rybalkina, Irina G., Xiao-Bo Tang, and Sergei D. Rybalkin.
"Multiple Affinity States of cGMP-Specific Phosphodiesterase for Sildenafil Inhibition Defined by cGMP-Dependent and cGMP-Independent Mechanisms." Molecular Pharmacology
77.4
(2010):
670-677.
Web. 07 July. 2022.