1. Crathorn, A. R., and Roberts, J. J., Nature, 211, 150 (1966).
2. Roberts, J. J., Brent, T. P., and Crathorn, A. R., The Interaction of Drug and Sub-cellular Components in Animal Cells, 5 (edit. by Campbell, P. N.) (J. and A. Churchill Ltd, London, 1968).
3. Crathorn, A. R., and Roberts, J. J., Prog. Biochem. Pharmacol., 1, 320 (1965).
4. Haynes, R. H., Photochem. Photobiol., 3, 429 (1964).
5. Walker, I. G., Science, 151, 99 (1966).