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3. ODIN: A new model and ephemeris for the Pluto system;Beauvalet;Astron. Astrophys.,2013
4. Orbital elements of Charon from speckle interferometry;Beletic;Icarus,1989
5. Speckle interferometry with the 3.60 M CFH telescope. I – Resolution of the Pluto–Charon system;Bonneau;Astron. Astrophys.,1980