1. Golden , T. Ionospheric distortion of minitrack signals in South America Greenbelt, Maryland 1968
2. Some studies of nighttime F-layer irregularities at the equator using very high frequency signals radiated from earth satellites;Kent;Ann. Geophys.,1966
3. Ionospheric studies using the tracking beacon on the Early Bird synchronous satellite;Koster;Ann. Geophys.,1966