1. Consensus development conference statement. Impotence. December 7–9, 1992;Int J Impot Res,1993
2. Papyrus ebers. English translation;Smith,1974
3. Erectile dysfunction through the ages;Shah;BJU Int,2002
4. Oral sildenafil in the treatment of erectile dysfunction;Goldstein;N Engl J Med,1998
5. Efficacy and safety of sildenafil citrate for treatment of erectile dysfunction in a population with associated organic risk factors;Guay;J Androl,2001