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摘要
Jiang and Niu [12] and Gyllenberg et al. [4] showed that nontrivial periodic orbits for three dimensional Ricker competitive system only occur in Jiang-Niu's classes 26 - 31. This paper proves that classes 27 - 31 for three dimensional Ricker competitive system admit at least three limit cycles, classes 26 - 31 possessing at least two limit cycles are also provided.
