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Open Physics > 2011 > 9 > 3 > 835-840
Open Physics > 2011 > 9 > 3 > 835-840
Open Physics > 2011 > 9 > 1 > 49-56
Open Physics > 2011 > 9 > 1 > 49-56
Open Physics > 2011 > 9 > 3 > 835-840
Open Physics > 2011 > 9 > 3 > 835-840
Open Physics > 2011 > 9 > 1 > 49-56
Open Physics > 2011 > 9 > 1 > 49-56