Physics Letters A
Physics Letters A > 2001 > 289 > 6 > 323-328
Physics Letters A > 2001 > 289 > 6 > 337-342
Physics Letters A > 2001 > 289 > 6 > 287-290
Physics Letters A > 2001 > 289 > 6 > 329-332
Physics Letters A > 2001 > 289 > 6 > 279-286
Physics Letters A > 2001 > 289 > 6 > 313-322
Physics Letters A > 2001 > 289 > 6 > 333-336
Physics Letters A > 2001 > 289 > 6 > 291-300
Physics Letters A > 2001 > 289 > 6 > 306-312
Physics Letters A > 2001 > 289 > 6 > 301-305