1. Lue TF, and Broderick G: Evaluation and nonsurgical management of erectile dysfunction and priapism, in Walsh PC, Retik AB, Vaughan ED Jr, et al (Eds): Campbell’s Urology. Philadelphia, WB Saunders, 1998, vol 2, pp 1181–1214.
2. Clinical value of nocturnal erection in the prognosis and diagnosis of impotence;Karacan;Med Aspect Hum Sex,1970
3. Investigation of erectile dysfunction;Meuleman;Urol Clin North Am,1995
4. Vasculogenic impotence evaluated by high-resolution ultrasonography and pulsed Doppler analysis;Lue;Radiology,1985
5. Intracavernous injection of papaverine for erectile failure;Virag;Lancet,1982