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Open Physics > 2009 > 7 > 1 > 193-197
Open Physics > 2009 > 7 > 1 > 193-197
Central European Journal of Physics > 2009 > 7 > 1 > 193-197
Open Physics > 2009 > 7 > 1 > 193-197
Open Physics > 2009 > 7 > 1 > 193-197
Central European Journal of Physics > 2009 > 7 > 1 > 193-197