Physics Letters A
Physics Letters A > 2010 > 374 > 4 > 544-551
Physics Letters A > 2010 > 374 > 9 > 1154-1158
Physics Letters A > 2010 > 374 > 25 > 2539-2550
Physics Letters A > 2010 > 374 > 31-32 > 3177-3184
Physics Letters A > 2010 > 374 > 4 > 544-551
Physics Letters A > 2010 > 374 > 9 > 1154-1158
Physics Letters A > 2010 > 374 > 25 > 2539-2550
Physics Letters A > 2010 > 374 > 31-32 > 3177-3184