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MR2273559 (2007i:34107) 34K13 (34A37 34K45)
Liu, Xiangsen; Li, Gang; Luo, Guilie Positive periodic solution for a two-species ratio-dependent predator-prey system with time delay and impulse. J. Math. Anal. Appl. 325 (2007), no. 1, 715–723.
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