1. Incidence ofsulphasalazine-induced male fertility;BIRNIE, G.G.; McLEAD, T.I.F.; WATKINSON, G.;Gut,1981
2. FREEMAN, J.G., REECE, V.A. & VENABLES, C.W. (1982).
3. LEVI, A.J., FISHER, A.M., HUGHES, L. & HENRY, W.F. (1979).
4. European Collaborative Group co-ordinated by Mayberry and Weterman. European survey of fertility and pregnancy in women with Crohn's disease. A case control study;MAYBERRY, J.; WETERMAN, I.,1986
5. Reversible male infertility due to sulphasalazine: studies in man and rat;O'MORAIN, C.; SMETHURST, P.; DORE, C.J.; LEVI, A.J.;Gut,1984