Open Physics
Open Physics > 2009 > 7 > 4 > 829-853
Open Physics > 2010 > 8 > 3 > 415-421
Open Physics > 2014 > 12 > 2 > 141-146
Open Physics > 2014 > 12 > 8 > 578-581
Open Physics > 2009 > 7 > 4 > 829-853
Open Physics > 2010 > 8 > 3 > 415-421
Open Physics > 2014 > 12 > 2 > 141-146
Open Physics > 2014 > 12 > 8 > 578-581