Vietnam Journal
of
MATHEMATICS

Volume 27, Number 3, 1999

---

20	Ninety Years of the Brouwer Fixed Point Theorem Sehie Park	187
21	Asymptotic and Oscillatory Behavior of Higher-Order Nonlinear Neutral Difference Equation Xin-Ping Guan and Jun Yang	223
22	On Capacity of Labeled Petri Net Languages Pham Tra An and Pham Van Thao	231
23	Quasi-Continuous Modules Relative to Modules Classes Semra Dogruoz and Patrick F. Smith	241
24	On the Quasi-Normality and Subnormality of Subgroups of Finite Groups Akbar Hassani and Shaban Sedghi	253
25	On Certain Length Functions Associated to a System of Parameters in Local Rings Nguyen Tu Cuong, Nguyen Thai Hoa, and Nguyen Thi Hong Loan	259
26	An Alternative Approach to the Associative Calibration Doan The Hieu	273