1. Stephenson, J. S., U.K. Patent No.909,357.
2. Black, J. W., and Stephenson, J. S., Lancet, ii, 311 (1962).
3. Alcock, S. J., and Bond, P. A., Proc. European Soc. Study of Drug Toxitity, 4, 30 (1964).
4. Crowther, A. F., and Smith, L. H., U.K. Patent Applications Nos. 44357/62 and 44358/62.
5. Black, J. W., Crowther, A. F., Shanks, R. G., Smith, L. H., and Dornhurst, A. C., Lancet, i, 1080 (1964).