Physicochemical properties of sildenafil citrate and sildenafil base
Petr Melnikov, Pedro P. Corbi, Alexandre Cuin, Mauricio Cavicchioli , Wellington R. Guimarães
Journal of Pharmaceutical Sciences
Volume 92 Issue 10, Pages 2140 - 2143
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http:/dx.doi.org/10.1002/jps.10469