1. Ackerman MD: Psychology’s role in assessment of erectile dysfunction: Historical precedents, current knowledge and methods. J Consult Clin Psychol (1995) 63:862–876
2. Arnetz BB, Theorell T, Levi L, Kallner A, Eneroth P: An experimental study of social isolation of elderly people: Psycho endocrine and metabolic effects. Psychisom Med (1983) 45:395–406
3. Becker AJ, Uckert S, Stief CG, Jonas U: Testosterone Plasma Levels in Healthy Males During Different Phases of Penile Erection. The Aging Male (2000) 3 (Suppl. 1): 10
4. Brock GB, Zvara P, Sioufi R, Begin LR, Schipper HM: Nitric oxide synthease is testosterone dependent. Int J impotence Res. (1994) 6 (Suppl. 1):21–23
5. Carruthers M: More effective Testosterone Treatment: Combination with Sildenafil and Danazol. The Aging Male (2000) 3 (Suppl. 1):16