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«Archived copy». Arxivat de l'original el 2007-09-07. [Consulta: 20 juliol 2007]. Mars distance and eccentricity, using Solex. By its creator, Aldo Vitagliano
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«Archived copy». Arxivat de l'original el 2007-09-07. [Consulta: 20 juliol 2007]. Mars distance and eccentricity, using Solex. By its creator, Aldo Vitagliano
Sheehan, William. «Appendix 1: Oppositions of Mars, 1901–2035». The Planet Mars: A History of Observation and Discovery. University of Arizona Press, 02-02-1997. Arxivat de l'original el June 25, 2010. [Consulta: 30 gener 2010].