1. The propagation of whistlers underneath the ionosphere;Allcock;J. Geophys. Res.,1966
2. Radiation of electromagnetic waves from a point source in a gyrotropic medium with a separation boundary;Barsukov;Radiotekhn. i Elektron.,1959
3. Wave hop theory of long distance propagatio of low-frequency radio waves;Berry;Radio Sci. J. Res. NBS,1964