3Feldman HA ,Goldstein I,Hatzichristou DG,et al. Impotence and its medical and psychosocial correlates: results of the Massachusetts Male Aging Study. J Urol, 1994, 515:54-61.
4Giuliano FA,Knellcson S,Paturand JP. Epidemiological Study of erectihe dysfunction in France. Eur Urol, 1996, 30(Supp2): 250. Abstract.
5Foreman MM,Doberty PC. Experimental approaches for the development of phamacological thearptes for execzile dysfunction, In: Sexual phamacology, oxford: oxford Medical Publications, 1993, 87-113.
6马晓年.勃起生理机制讲座.面向廿一世纪的性与健康.北京：中国人口出版社．1999．81-86.
7Furchgott RF. The discovery endothelium dependent relaxation, Circukation, 1993. 87.
8Culotta E. NO news is good news. Science, 1992285:1862-1865.
