... of Mathematics and Econometrics, Hunan University, Changsha,Hunan 410082, ChinaE-mail address: lhhuang@hnu.net.cnGuang Zhang: Department of Mathematics, Qingdao Institute of Architecture and ... Difference Equations and Inequalities. Theory, Methods, and Applications,2nded.,Monographs and Textbooks in Pure and Applied Mathematics, vol. 228, Marcel Dekker, NewYork, 2000.[2] Y. Chen and J. ... PERIODICITY OF SOLUTIONSFOR A CLASS OF DIFFERENCE SYSTEMS HONGHUA BIN, LIHONG HUANG, AND GUANG ZHANGReceived 16 January 2006; Revised 27 July 2006; Accepted 28 July 2006Aclassofdifference systems of artificial...