1. Ionospheric investigations using sweep-frequency pulse techniques at oblique incidence;Agy;Radio Sci.,1959
2. Aperiodic aerials for use with vertical-incidence ionospheric recorders;Bailey;Wireless Eng.,1951
3. Real-time frequency management for military HF communications;Fenwick;Telecommunications,1980
4. Grubb , R. N. The NOAA SEL HF radar system (ionospheric sounder) Boulder, Colo. 1979