期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：2011
卷号：2011
DOI：10.1155/2011/376862
出版社：Hindawi Publishing Corporation
摘要：By using a continuation theorem based on coincidence degree theory, we establish some easily verifiable criteria for the existence of positive periodic solutions for neutral delay ratio-dependent predator-prey model with Holling-Tanner functional response 𝑥(𝑡)=𝑥(𝑡)[𝑟(𝑡)−𝑎(𝑡)𝑥(𝑡−𝜎(𝑡))−𝑏(𝑡)𝑥(𝑡−𝜎(𝑡))]−𝑐(𝑡)𝑥(𝑡)𝑦(𝑡)/(ℎ(𝑡)𝑦(𝑡)
