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Open Physics > 2006 > 4 > 1 > 117-123
Open Physics > 2006 > 4 > 1 > 117-123
Acta Physica Polonica A > 2005 > 107 > 2 > 240-244
Open Physics > 2006 > 4 > 1 > 117-123
Open Physics > 2006 > 4 > 1 > 117-123
Acta Physica Polonica A > 2005 > 107 > 2 > 240-244