1. Passive radio observations of Mercury, Venus, Mars, Saturn and Uranus;Barrett;Radio Sci.,1965
2. Passive radio observations of Mercury, Venus, Mars, Saturn and Uranus;Barrett;Radio Sci.,1965
3. Radar interferometric observations of Venus at 70-cm wavelength;Campbell;Science,1970
4. Venus: topography revealed by radar data;Campbell;Science,1972
5. A radar determination of the rotation of Venus;Carpenter;Astron. J.,1970