5Zhang Cuimei Chen Wencheng Yang Yu ( College of Information Science and Engineering, Shandong University of Science and Technology, Taian 271019,College of Information Science and Engineering, Shandong Agricultural University, Taian 271018).THE LIMIT CYCLES OF A KIND OF EXPLOITED PREDATOR-PREY SYSTEM[J].Annals of Differential Equations,2006,22(3):442-445.
