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Physics Letters A > 1997 > 225 > 4-6 > 239-244
Physica A: Statistical Mechanics and its Applications > 1996 > 225 > 2 > 221-234
Physics Letters A > 1997 > 225 > 4-6 > 239-244
Physica A: Statistical Mechanics and its Applications > 1996 > 225 > 2 > 221-234