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Existence of Two Positive Periodic Solutions for a Neutral Multi-Delay Logarithmic Population Model with a Periodic Harvesting Rate

and Technology, Yunnan 650500, China Received 14 July 2012; Accepted 12 November 2012 Academic Editor: Wing-Sum Cheung Copyright © 2012 Hui Fang. This is an open access article distributed under

Existence of Two Positive Periodic Solutions for a Neutral Multi-Delay Logarithmic Population Model with a Periodic Harvesting Rate

and Technology, Yunnan 650500, China Received 14 July 2012; Accepted 12 November 2012 Academic Editor: Wing-Sum Cheung Copyright © 2012 Hui Fang. This is an open access article distributed under