Vietnam Journal
of
MATHEMATICS

Volume 25, Number 3, 1997

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22	Non-Archimedean Mellin Transform and p-Adic L-Functions A. A. Panchishkin	179
23	On a Non-convex Optimization Problem in the Inventory Control System Nguyen Duc Nghia and Nguyen Trong Toan	203
24	Homotopy Invariance of Entire Current Cyclic Homology Do Ngoc Diep and Nguyen Van Thu	211
25	Two Species Competition in Almost Periodic Enviroment Trinh Tuan Anh and Tran Van Nhung	229
26	Interval-Valued Probabilistic Logic for a Class of Horn Clauses Ha Dang Cao Tung	241
27	Lower Estimations for the Lyapunov Exponents of Linear Systems of Differential Equations Perturbed by White Noise Nguyen Dinh Cong	253
28	On a Characterization of Two-Sided Exponential Distribution and Its Stability Tran Kim Thanh	267
29	On a Problem of H. Freudenthal Tongsong Jiang and Xuehan Cheng	271
30	On Non-Linear Approximation of Multivariate Functions with a Mixed Smoothness Dinh Dung	275