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Mathematica Slovaca > 2012 > 62 > 6 > 1069-1078
International Journal of Theoretical Physics > 2005 > 44 > 12 > 2239-2248
Mathematica Slovaca > 2012 > 62 > 6 > 1069-1078
International Journal of Theoretical Physics > 2005 > 44 > 12 > 2239-2248