1. The ionospheric propagation of radio waves of frequency 16 kc/s over distances of about 540 km;Bain;Proc. IEE,1952
2. General phase variations observed at College, Alaska;Bates;J. Geophys. Res.,1965
3. Diurnal phase changes in the arctic propagation of VLF waves;Blackband;Radio Sci. J. Res. NBS,1964
4. The ionospheric propagation of low- and verylow-frequency radio waves over distances less than 1000 km;Bracewell;Proc. IEE,1951