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Open Physics > 2013 > 11 > 2 > 231-238
Open Physics > 2013 > 11 > 2 > 231-238
Open Physics > 2011 > 9 > 2 > 446-453
Open Physics > 2011 > 9 > 2 > 446-453
Open Physics > 2009 > 7 > 4 > 654-662
Open Physics > 2009 > 7 > 4 > 654-662