1. Bornman, M.S., du Plessis, D.J., Coetzee, WJ.C., and Franz, R.C., 1986, Penile hypercoagulability during erection:a possible predisposing factor to ageing penile vascular changes, Br J Urol. 58: 98.
2. Bornman, M.S., du Plessis, D.J, Franz, R.C., and Coetzee, W.J.C., 1983, Penile hypercoagulability as a predisposing factor to ageing impotence, South Afr Med J. 63: 472.
3. Dormehl, I.C., Bornman, M.S., du Plessis, D.J., du Plessis, M., and Maree, M., 1984, The use of autologous 111In-labelled platelets and scintigraphy to illustrate enhanced platelet activity during erection in the Chacma baboon, Nucl Med. 23: 331.
4. Franz, R.C., and Coetzee, W.J.C., 1981, Thrombelastographic diagnosis of hemostatic defects, Surg Ann. 13: 75.
5. Godschalk, M., Gheorghiu, D., Chen, J., Gary Katz, P., and Mulligan, T., 1996, Long-term efficacy of a new formulation of prostaglandin E1 as treatment for erectile failure, J Urol. 155: 915.