Open Physics
Open Physics > 2003 > 1 > 3 > 516-555
Open Physics > 2004 > 2 > 4 > 698-708
Open Physics > 2009 > 7 > 3 > 444-456
Open Physics > 2009 > 7 > 3 > 457-471
Open Physics > 2012 > 10 > 1 > 86-95
Open Physics > 2012 > 10 > 3 > 552-559