1. The ELF and VLF amplitude spectrum of atmospherics with particular reference to the attenuation band near 3 kHz;Barr;Journal of Atmospheric and Terrestrial Physics,1970
2. Multimode propagation in the Earth-ionosphere waveguide;Barr,1974
3. Power line harmonic radiation: sources and environmental effects;Bullough,1995
4. The Sheffield University experiment on the satellite Ariel 3;Bullough;J. Sci. Inst. Series 2,1968
5. VLF observations on Ariel 3;Bullough,1969