Physics Letters A
Physics Letters A > 1997 > 236 > 4 > 345-350
Physics Letters A > 1997 > 236 > 4 > 270-274
Physics Letters A > 1997 > 236 > 4 > 356-359
Physics Letters A > 1997 > 236 > 4 > 301-306
Physics Letters A > 1997 > 236 > 4 > 339-344
Physics Letters A > 1997 > 236 > 4 > 329-338
Physics Letters A > 1997 > 236 > 4 > 322-328
Physics Letters A > 1997 > 236 > 4 > 351-355
Physics Letters A > 1997 > 236 > 4 > 307-313
Physics Letters A > 1997 > 236 > 4 > 275-279
Physics Letters A > 1997 > 236 > 4 > 280-288
Physics Letters A > 1997 > 236 > 4 > 289-295
Physics Letters A > 1997 > 236 > 4 > 263-269
Physics Letters A > 1997 > 236 > 4 > 319-321
Physics Letters A > 1997 > 236 > 4 > 257-262
Physics Letters A > 1997 > 236 > 4 > 296-300
Physics Letters A > 1997 > 236 > 4 > 314-318