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Shuohong Guo,Qishou Chen,Lei Li,Phys.Rev,D49(1994)507.[2]Qishou Chen et al, Phys Rev,D50(1994)3564.[3]惠萍、陈启洲,高能物理与核物理,19(1995)820.[4]K.Farakos,G.Koutsoumbas,S. Sarantakos, Phys. Lett, B189(1987)173.