Anderson, John D.; Slade, Martin A.; Jurgens, Raymond F.; Lau, Eunice L.; Newhall, X. X.; Myles, E. (July 1990). Radar and spacecraft ranging to Mercury between 1966 and 1988. IAU, Asian-Pacific Regional Astronomy Meeting, 5th, Proceedings. Proceedings of the Astronomical Society of Australia (Held July 16–20, 1990). Vol. 9, no. 2. Sydney, Australia: Astronomical Society of Australia. p. 324. Bibcode:1991PASAu...9..324A. ISSN0066-9997.
Anderson, John D.; Slade, Martin A.; Jurgens, Raymond F.; Lau, Eunice L.; Newhall, X. X.; Myles, E. (July 1990). Radar and spacecraft ranging to Mercury between 1966 and 1988. IAU, Asian-Pacific Regional Astronomy Meeting, 5th, Proceedings. Proceedings of the Astronomical Society of Australia (Held July 16–20, 1990). Vol. 9, no. 2. Sydney, Australia: Astronomical Society of Australia. p. 324. Bibcode:1991PASAu...9..324A. ISSN0066-9997.