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International Journal of Theoretical Physics > 2016 > 55 > 4 > 2040-2052
International Journal of Theoretical Physics > 2015 > 54 > 4 > 1362-1369
International Journal of Theoretical Physics > 2016 > 55 > 4 > 2040-2052
International Journal of Theoretical Physics > 2015 > 54 > 4 > 1362-1369