Open Physics
Open Physics > 2008 > 6 > 3 > 524-529
Open Physics > 2009 > 7 > 3 > 444-456
Open Physics > 2014 > 12 > 3 > 185-191
Open Physics > 2014 > 12 > 10 > 714-718
Open Physics > 2008 > 6 > 3 > 524-529
Open Physics > 2009 > 7 > 3 > 444-456
Open Physics > 2014 > 12 > 3 > 185-191
Open Physics > 2014 > 12 > 10 > 714-718