1Karacan I, Williams RT, Thornby JI. Sleep related tumescence as alfunation of age[J]. Am J Pschiatry, 1975,132:932-937.
2Knoll LD, Abrams JH. Nocturnal electrobioimpedance volumetric assessment of patient with erectile dysfunotion [J]. Urology, 1999, 53(6):1200-1204.
3KnoL LD, Abrams JH. Application of nocturnal electrobioim- pedance volumetric assessment: a feasibility study in men without erectile dysfunction [J]. J urol, 1999,161:1137-1140.
4Goldstein I. Oral sildenafil in the treatment of erectile dysfunction [J]. N Eng J Med, 1998,338:1397-1404.
5Montorsi F. Sildenafil taken at bedtime significantly increases nocturnal erections : result of a placebo-controlled study [J]. Urology, 2000,56: 906-911.
6Yaman O, Tokath Z, Inal T. Effect of sildenafil on nocturnal erections of potent men [J]. International Jounal of Impotence Research, 2003,15:117-121.
7Burnett AL. Nitric Oxide in the penis: Physiology and pathophxysiolog [J]. J urol ,1997,157:320-324.
8Abdel-Naser MB, Imam A. Wollina U,Sildnafil citrate significantly improves nocturnal penile erections in sildenafil non-responding patients with psychogenic erectile dysfunction [J]. International Journal Impetence Research, 2004,16 : 532-556.
9Teradas C, Leralle O, Nageberg A. Sildenafil improves nocturnal penile erections in organic impotence [J]. International Journal of Impotence, Research, 2001,13 :125-129.