Physics Letters A
Physics Letters A > 2008 > 372 > 3 > 223-232
Physics Letters A > 2008 > 372 > 5 > 648-653
Physics Letters A > 2008 > 372 > 7 > 1070-1076
Physics Letters A > 2008 > 372 > 23 > 4210-4216
Physics Letters A > 2008 > 372 > 29 > 4905-4912
Physics Letters A > 2008 > 372 > 33 > 5394-5401