Open Physics
Open Physics > 2003 > 1 > 3 > 463-473
Open Physics > 2004 > 2 > 2 > 254-265
Open Physics > 2006 > 4 > 3 > 310-317
Open Physics > 2008 > 6 > 3 > 634-637
Open Physics > 2009 > 7 > 4 > 654-662
Open Physics > 2011 > 9 > 2 > 410-416
Open Physics > 2011 > 9 > 6 > 1472-1481