1. Watt, A.D.: VLF Radio Engineering, (Pergamon, Oxford 1967)
2. ‘High performance reliable VLF component of the Naval Advanced Communications System: Measurement of VLF system performance in atmospheric noise’, Interim Report, 34-R-3, Dew Electronics Inc., Boulder, Colo., 1963 Contract NOBSR-85360
3. ‘VLF Modem Performance in Atmospheric Noise’, Special Tech-Report, 1, Stanford Research Institute, Menlo Park, Calif., 1970 Contract E22-141-69(N), SRI project 8078
4. ‘Optimal binary detection of known signals in a non-gaussian noise resembling vlf atmospheric noise’, Wescon convention record, 1968 p. 1 Part 4