by S. H. Wittwer and S. Honma. by E. T. Whittaker and G. N. Watson. by J.W. Weller and A. Youle. by K.B. Mather and P. Swan. by R. G. Palmer and A. Platt. by D.J. Littler and J.F. Raffle. by A. C. Ainger and H. G. Wintle. by M. W. Porter and R. C. Spiller. by D. F. Spooner and W. H. Grinsted. by John C. Slater and N. H. Frank.