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International Journal of Theoretical Physics > 2011 > 50 > 12 > 3669-3681
International Journal of Theoretical Physics > 2010 > 49 > 12 > 3022-3029
International Journal of Theoretical Physics > 2011 > 50 > 12 > 3669-3681
International Journal of Theoretical Physics > 2010 > 49 > 12 > 3022-3029