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Open Physics > 2012 > 10 > 1 > 172-180
Open Physics > 2012 > 10 > 1 > 172-180
Open Physics > 2010 > 8 > 3 > 283-288
Open Physics > 2010 > 8 > 3 > 283-288
Open Physics > 2009 > 7 > 4 > 721-730
Open Physics > 2009 > 7 > 4 > 721-730