Physics Letters A
Physics Letters A > 2010 > 374 > 4 > 557-561
Physics Letters A > 2010 > 374 > 13-14 > 1493-1496
Physics Letters A > 2010 > 374 > 30 > 3025-3028
Physics Letters A > 2010 > 374 > 4 > 557-561
Physics Letters A > 2010 > 374 > 13-14 > 1493-1496
Physics Letters A > 2010 > 374 > 30 > 3025-3028