Vol. 26 No. 3, 2001

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Special issue  dedicated to Professor Pham Huu Sach on the occasion of his sixtieth birthday.
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B. D. Craven, On nonconvex optimization
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249
A. Guerraggio, D. T. Luc and N. B. Minh, Second-order optimality conditions for C1multiobjective programming problems
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257
Nguyen Ngoc Hai and Hoang Xuan Phu, Boundedness of symmetrically γ-convex functions
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269
Phan Quoc Khanh and Le Minh Luu,  Necessary optimality conditions in problems involving set-valued maps with parameters
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279
G. M. Lee, J. Y. Shin and H. S. Sim, A counterexample on the closedness of the convex hull of a closed cone in Rn
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297
Jing Liu and Wen Song, On proper efficiencies in locally convex spaces- A survey 
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301
J. E. Martinez-Legaz and A. M. Rubinov,  Increasing positively homogeneous functions defined on R^n
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313
Le Dung Muu and Nguyen Van Quy, Methods for finding global optimal solutions to linear programs with equilibrium constraints
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333
Sehie Park, Some equilibrium problems in generalized convex spaces
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349
Jean-Paul Penot, Mean value theorems for correspondences
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365
Nguyen Nang Tam, Directional differentiability of the optimal value function  in indefinite quadratic programming
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377
Tran Duc Van and Mai Duc Thanh, On explicit viscosity solutions to nonconvex- nonconcave Hamilton-Jacobi equations
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395
Nguyen Dong Yen and Bui Trong Kim, Linear operators satisfying the assumptions of some generalized Lax-Milgram theorems
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407