1. Rajfer J, Aronson WJ, Bush PA, Dorey FJ, Ignarro LJ. Nitric oxide as a mediator of relaxation of the corpus cavernosum in response to nonadrenergic, noncholinergic neurotransmission. N Engl J Med 1992;326:90-94.
2. Montorsi F, Salonia A, Deho F, Cestari A, Guazzoni G, Rigatti P, Stief C. Pharmacologic management of erectile dysfunction. BJU Int 2003;91:446-454.
3. Broderick GA. Oral pharmacotherapy and the contemporary evaluation and management of erectile dysfunction. Rev Urol 2003;5:Suppl 7. S9-S20.
4. Uckert S, Mayer ME, Stief CG, Jonas U. The future of the oral pharmacotherapy of male erectile dysfunction: things to come. Expert Opin Emerg Drugs 2007;12:219-228.
5. Mulhall JP. Current and future pharmacotherapeutic strategies in treatment of premature ejaculation. Urology 2006;67:9-16.