Open Physics
Open Physics > 2008 > 6 > 1 > 45-51
Open Physics > 2011 > 9 > 1 > 146-156
Open Physics > 2011 > 9 > 3 > 662-673
Open Physics > 2011 > 9 > 4 > 898-908
Open Physics > 2011 > 9 > 5 > 1372-1378
Open Physics > 2011 > 9 > 6 > 1493-1502
Open Physics > 2012 > 10 > 2 > 320-328
Open Physics > 2012 > 10 > 4 > 779-788