A Positive Periodic Solution to a Class of Neutral Delay Logarithmic Model
（1.College of Mathematics and Econometrics,Hunan University,Changsha 410082,China;2.Hunan Industry Polytechnic,Changsha 410208,China;3.Hunan University Press，Changsha 410082,China）
[1] HUANG Yong-ming,CAO Jin-de.Postive Periodic Solutionns of a Delayed Model in Population [J].Pure. and Appl. Math.，1999,15(1)：68-71.[2] LI Yong-kun.On a Periodic Neutral Delay Logarithmic Population Model [J].J. Sys. Sci. & Math. Scis.，1999,19(1):34-38.[3] 刘开宇,厉亚.中立型对数种群模型的周期正解 [J].汕头大学学报，2000,15(2):62-65.[4] GAINES R,MAWHIN J.Coincide Degree and Nonlinear Differential Equation [M].Berlin:Springer-Verlag,1977.
