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International Journal of Theoretical Physics > 2012 > 51 > 10 > 3290-3302
Astrophysics and Space Science > 2011 > 334 > 2 > 273-279
Astrophysics and Space Science > 2011 > 336 > 2 > 419-426
Astrophysics and Space Science > 2011 > 333 > 1 > 143-148