Persistence and Periodic Solution on a Nonautonomous SIS Model with Delays

Author: Yuan San-ling   Ma Zhi-en   Jin Zhen  

Publisher: Springer Publishing Company

ISSN: 0168-9673

Source: Acta Mathematicae Applicatae Sinica, Vol.19, Iss.1, 2003-03, pp. : 167-176

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