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Open Physics > 2009 > 7 > 2 > 232-236
Open Physics > 2009 > 7 > 2 > 232-236
Central European Journal of Physics > 2009 > 7 > 2 > 232-236
Open Physics > 2009 > 7 > 2 > 232-236
Open Physics > 2009 > 7 > 2 > 232-236
Central European Journal of Physics > 2009 > 7 > 2 > 232-236