1. Transequatorial reception of a very-low-frequency transmission;Chilton;J. Geophys. Res.,1964
2. Periodic fading of VLF signals received over long paths during sunrise and sunset;Crombie;J. Res. NBS,1964
3. Diurnal field strength and phase variations on VLF (NWC signals) transmissions over the transequatorial path, 1;Ishii;Rev. Radio Res. Lab.,1968