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Mathematica Slovaca > 2011 > 61 > 2 > 155-172
International Journal of Theoretical Physics > 2009 > 48 > 5 > 1320-1333
Mathematica Slovaca > 2011 > 61 > 2 > 155-172
International Journal of Theoretical Physics > 2009 > 48 > 5 > 1320-1333