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Astrophysics and Space Science > 2015 > 355 > 1 > 147-153
International Journal of Theoretical Physics > 2012 > 51 > 5 > 1386-1395
Astrophysics and Space Science > 2015 > 355 > 1 > 147-153
International Journal of Theoretical Physics > 2012 > 51 > 5 > 1386-1395