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Planetary and Space Science > 2010 > 58 > 1-2 > 300-308
Celestial Mechanics and Dynamical Astronomy > 2007 > 97 > 3 > 165-187
Celestial Mechanics and Dynamical Astronomy > 2006 > 96 > 2 > 99-127
Foundations of Physics Letters > 1998 > 11 > 4 > 379-389