Open Physics
Open Physics > 2010 > 8 > 6 > 864-872
Open Physics > 2011 > 9 > 5 > 1366-1371
Open Physics > 2014 > 12 > 6 > 427-432
Open Physics > 2010 > 8 > 6 > 864-872
Open Physics > 2011 > 9 > 5 > 1366-1371
Open Physics > 2014 > 12 > 6 > 427-432