Vietnam Journal
of
MATHEMATICS

Volume 28, Number 4, 2000

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30	Some Sufficient Conditions for the Existence of Equiblirium Points Concerning Multivalued Mappings Nguyen Ba Minh and Nguyen Xuan Tan	295
31	On the L - Minimizing Networks in R^n Nguyen Huu Quang	311
32	Is a Right Perfect Right Self-Injective Ring Right PF? Dinesh Khurana	321
33	An Algorithm for Optimizing Over the Efficient Set Nguyen Thi Bach Kim	329
34	Bounds for Cohomological Hilbert-Functions of Projective Schemes Over Artinian Rings M. Brodmann, C. Matteotti, and Nguyen Duc Minh	341
35	On Entropy Numbers and Non-Linear Approximation by Sets of Finite Pseudo-Dimension Dinh Dung	381