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Open Physics > 2012 > 10 > 2 > 533-537
Open Physics > 2012 > 10 > 2 > 533-537
Central European Journal of Physics > 2012 > 10 > 2 > 533-537
Open Physics > 2012 > 10 > 2 > 533-537
Open Physics > 2012 > 10 > 2 > 533-537
Central European Journal of Physics > 2012 > 10 > 2 > 533-537