[by] J. N. Murrell and A. J. Harget. by R. N. Haszeldine and A. G. Sharpe. J.N. Murrell and E.A. Boucher. by G. B. Ansell and J. N. Hawthorne. by J. C. Jaeger and A. M. Starfield. by J. H. Cairns and P. T. Gilbert. by J. L. Bell and M. Machover. by J. V. Dacie and S. M. Lewis. by J. M. Boeynaems and J. E. Dumont. by J. R. Drabble and H. J. Goldsmid.