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International Journal of Theoretical Physics > 2008 > 47 > 5 > 1424-1431
International Journal of Theoretical Physics > 2006 > 45 > 10 > 1814-1824
International Journal of Theoretical Physics > 2008 > 47 > 5 > 1424-1431
International Journal of Theoretical Physics > 2006 > 45 > 10 > 1814-1824