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Astrophysics > 2011 > 54 > 2 > 269-276
Astrophysics and Space Science > 2006 > 305 > 1 > 49-55
Astrophysics > 2004 > 47 > 4 > 555-567
Chinese Astronomy and Astrophysics > 2003 > 27 > 3 > 269-277
Chinese Astronomy and Astrophysics > 2003 > 27 > 1 > 42-65