1. Earp, C.W.: ‘Frequency indicating cathode ray oscilloscope’, US, (2434914)
2. Frum, A.: ‘Frequency measuring system’, US, (2480128)
3. Instantaneous Frequency-Measuring Receivers (Letters)
4. Goddard, N.E., and Robinson, S.J.: ‘Broadband hybrid junction’, (British Patent 818018)
5. Robinson, S.J.: ‘Broadband microwave discriminator’, (British Patent 953430)