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：1996
卷号：19
DOI：10.1155/S0161171296001123
出版社：Hindawi Publishing Corporation
摘要：A model originally suggested by Greenhalgh [12] and later modified by that same
author [13,14] is considered under the assumption that the transmission coefficient is inversely
proportional to the total population size. The purpose of this study is to see the effect of this density
dependent transmission coefficient on the stability criteria for the equilibrium of the model equations. It
is found that Greenhalgh’s results are still valid.
