Physics Letters A
Physics Letters A > 2006 > 349 > 1-4 > 177-186
Physics Letters A > 2006 > 350 > 3-4 > 182-191
Physics Letters A > 2006 > 360 > 1 > 122-130
Physics Letters A > 2006 > 349 > 1-4 > 177-186
Physics Letters A > 2006 > 350 > 3-4 > 182-191
Physics Letters A > 2006 > 360 > 1 > 122-130