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CONTENTS Volume 37, Number 4, 2009 Applications of Fixed Point Theorems for Acyclic Maps-A Review Sehie Park  419 On Bootstrapping Regression and Correlation Models with Random Resample Size Nguyen Van Toan 443 On the Electric-magnetic Goddard-Nuyts-Olive Duality Do Ngoc Diep and Ha Dai Ton  457 Approximation on a Bidisk Nguyen Quang Dieu and Kieu Phuong Chi  463 MPageRank: The Stability of Web Graph Le Trung Kien, Le Trung Hieu, Tran Loc Hung, and Le Anh Vu 475 Central Limit Theorems for Mixing Arrays II Dao Quang Tuyen 491 Some Continuous Properties of Norm in Orlicz-Lorentz Spaces Vu Nhat Huy  503 On Generalized δ-Supplemented Modules Yahya Talebi and Behnam Talaee  515 Rings over which Polynomial Rings are Semi-commutative Yang Gang and Du Ruijuan  527 Oscillation for a Nonlinear Difference Equation Dinh Cong Huong  537

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