1957 · A.C. Lynch · The proceedings of the Institution of Electrical Engineers. Part B, Radio and electronic engineering, including communication engineering · 15
1957 · A.C. Lynch · The proceedings of the Institution of Electrical Engineers. Part B, Radio and electronic engineering, including communication engineering · 10
1957 · C.E. Richards, E.V. Walker, et al. · The proceedings of the Institution of Electrical Engineers. Part B, Radio and electronic engineering, including communication engineering · 7