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Open Physics > 2004 > 2 > 4 > 698-708
Open Physics > 2004 > 2 > 4 > 698-708
Open Physics > 2004 > 2 > 1 > 67-89
Open Physics > 2004 > 2 > 1 > 67-89
Open Physics > 2004 > 2 > 4 > 698-708
Open Physics > 2004 > 2 > 4 > 698-708
Open Physics > 2004 > 2 > 1 > 67-89
Open Physics > 2004 > 2 > 1 > 67-89