1. Devriendt, A., Jansen, P.H., and Weemaes, I, (1970). European Journal of Clinical Pharmacology 3: 36–42.
2. Williams, J.D., Brumfitt, W., Condie, A.P., and Reeves, D.S. (1969). Postgraduate Medical Journal. 45, November suppl. 71–5.
3. Williams, J.D., Brumfitt, W., Leigh, D.A. and Percival, A. (1965). Lancet i; 831–4.
4. Williams, J.D., Condie, A.P., Franklin, I.N.S., Leigh, D.A., Reeves, D.S., and Brumfitt, W. (1968). Ed. O’Grady and Brumfitt, W., London, pp 160–169.
5. Williams, J.D., and Smith, E.K. (1970). British Medical Journal, 651–3.