Open Physics
Open Physics > 2011 > 9 > 2 > 313-318
Open Physics > 2011 > 9 > 2 > 354-359
Open Physics > 2011 > 9 > 2 > 349-353
Open Physics > 2011 > 9 > 6 > 1536-1539
Open Physics > 2013 > 11 > 2 > 239-244
Open Physics > 2013 > 11 > 7 > 928-935