by K. G. Beauchamp and C. K. Yuen. by K.G. Beauchamp and C.K. Yuen. by A. P. Dunlop and F. N. Peters. by J. M. Camp and C. B. Francis. by R. B. Heslop and K. Jones. by T. M. Cook and D. J. Cullen. by R. E. D. Bishop and D. C. Johnson. by G.E. Beaumont and E.C. Dodds. by J. Fouchier and F. Billet. by P.L. Knight and L. Allen.