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Open Physics > 2014 > 12 > 2 > 123-131
Open Physics > 2014 > 12 > 2 > 123-131
Central European Journal of Physics > 2014 > 12 > 2 > 123-131
Czechoslovak Journal of Physics > 2001 > 51 > 8 > 781-784
Journal of Geometry and Physics > 1998 > 26 > 3-4 > 227-246