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International Journal of Theoretical Physics > 2013 > 52 > 4 > 1052-1060
International Journal of Theoretical Physics > 2013 > 52 > 2 > 354-361
Journal of Geometry and Physics > 2012 > 62 > 3 > 692-705
Astrophysics and Space Science > 2008 > 317 > 1-2 > 83-88