Physics Letters A
Physics Letters A > 1996 > 212 > 4 > 195-200
Physics Letters A > 1996 > 212 > 4 > 201-208
Physics Letters A > 1996 > 212 > 4 > 227-230
Physics Letters A > 1996 > 212 > 4 > 231-236
Physics Letters A > 1996 > 212 > 4 > 188-194
Physics Letters A > 1996 > 212 > 4 > 221-226
Physics Letters A > 1996 > 212 > 4 > 213-220
Physics Letters A > 1996 > 212 > 4 > 183-187
Physics Letters A > 1996 > 212 > 4 > 237-240
Physics Letters A > 1996 > 212 > 4 > 209-212