Physics Letters A
Physics Letters A > 2006 > 350 > 1-2 > 150-153
Physics Letters A > 2006 > 352 > 6 > 538-542
Physics Letters A > 2006 > 353 > 2-3 > 221-225
Physics Letters A > 2006 > 359 > 4 > 261-264
Physics Letters A > 2006 > 350 > 1-2 > 150-153
Physics Letters A > 2006 > 352 > 6 > 538-542
Physics Letters A > 2006 > 353 > 2-3 > 221-225
Physics Letters A > 2006 > 359 > 4 > 261-264