Aversa A, Pili M, Francomano D, Bruzziches R, Spera E, La Pera G, Spera G (July 2009). Effects of vardenafil administration on intravaginal ejaculatory latency time in men with lifelong premature ejaculation. International Journal of Impotence Research. 21 (4): 221—7. doi:10.1038/ijir.2009.21. PMID19474796.
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Aversa A, Pili M, Francomano D, Bruzziches R, Spera E, La Pera G, Spera G (July 2009). Effects of vardenafil administration on intravaginal ejaculatory latency time in men with lifelong premature ejaculation. International Journal of Impotence Research. 21 (4): 221—7. doi:10.1038/ijir.2009.21. PMID19474796.
Kloner RA (December 2005). Pharmacology and drug interaction effects of the phosphodiesterase 5 inhibitors: focus on alpha-blocker interactions. The American Journal of Cardiology. 96 (12B): 42M—46M. doi:10.1016/j.amjcard.2005.07.011. PMID16387566.
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Schools of Pharmacy (Glen L. Stimmel, Pharm.D., and Mary A. Gutierrez, Pharm.D.) and Medicine (Glen L. Stimmel, Pharm.D.), University of Southern California, Los Angeles, California. Counseling Patients About Sexual Issues: Drug-Induced Priapism. Medscape. Архів оригіналу за 11 травня 2015. Процитовано 6 грудня 2010.