References
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- http://igscb.jpl.nasa.gov/
- http://www.asgeupos.pl/
- http://www.epncb.oma.be
- Personal communications (2012) with Elmar Brockmann, Alessandro Caporali, Jan Dousa, Heinz Habrich, Ambrus Kenyeres, Martin Lidberg and Guenter Stangl.