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International Journal of Theoretical Physics > 2013 > 52 > 3 > 788-792
International Journal of Theoretical Physics > 2013 > 52 > 8 > 2537-2545
International Journal of Theoretical Physics > 2011 > 50 > 8 > 2526-2530
International Journal of Theoretical Physics > 2013 > 52 > 3 > 788-792
International Journal of Theoretical Physics > 2013 > 52 > 8 > 2537-2545
International Journal of Theoretical Physics > 2011 > 50 > 8 > 2526-2530