1. Doppler shifts on high-frequency ground backscatter;Agy;J. Geophys. Res.,1969
2. The refraction and Doppler shift of radio waves emanating from an artificial earth satellite in a three-dimensiona lnonhomogeneous ionosphere;Al'pert;Geomagn. Aeron.,1963
3. Ionospheric raytracing for simulation of high-frequency over-the-horizon earth backscatter;Althouse;Nav. Res. Lab. Rep.,1971
4. HF backscatter observations of sporadic E during the IQSY;Baggaley;J. Geophys. Res.,1969
5. The effect of a solar flare on the frequency of high-frequency ground backscatter;Barry;J. Geophys. Res.,1962