[1]Deimling K. Nonlinear Functional Analysis. New York: Springer-Verlag, 1985

[2]Luo Jiaowan, Yu Jiangshe. Global asymptoticstability of nonautonomous mathematical ecological equa-tions with distributed deviating arguments. Acta Mathematica Sinica, 1998, 41: 1273-1282

[3]Krasnoselskii M A. Positive Solution of Operator Equation. Gorningen: Noordhoff, 1964

[4]Weng P, Liang M. The existence and behavior of periodic solution of Hematcpoiesis model. Mathematica Applicate, 1995, 8: 434-439

[5]Weng P. Existence and global attractivity of periodic solution of interodifferential equation in population dynamics. Acta Appl Math, 1996, 12: 427-434

[6]Gurney W S C, Blythe S P, Nisbet R M. Nicholson’s blowfies revisited. Nature, 1980,287: 17-20

[7]Gopalsamy K, Weng P. Global attractivity and level crossing in model of Hoematcpoiesis. Bulletin of the Institute of Mathematics, Academia Sinica, 1994,22: 341-360

[8]Joseph W-H So, Yu Jianshe. Global attractivity and uniformly persistence in Nicholson’s blowfies. Differ-ential Equation and Dynamics Systems, 1994, 2: 11-18

[9]Mackey M C, Galass. Oscillations and chaos in phycological control systems. Sciences, 1987, 197: 287-289

[10]Yoshizawa T. Stability Theory By Liapunov Second Method. The Mathematical Society of Japam, 1966