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International Journal of Theoretical Physics > 2009 > 48 > 3 > 836-846
Astrophysics and Space Science > 2008 > 314 > 1-3 > 79-82
Astrophysics and Space Science > 2008 > 317 > 3-4 > 279-281
International Journal of Theoretical Physics > 2009 > 48 > 3 > 836-846
Astrophysics and Space Science > 2008 > 314 > 1-3 > 79-82
Astrophysics and Space Science > 2008 > 317 > 3-4 > 279-281