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CONTENTS Volume 35, Number 4 December 2007 Singular Difference Equations: An Overview Pham Ky Anh, Nguyen Huu Du, and Le Cong Loi  339 Admissible Transformations and Assignment Problems Rainer E. Burkard 373 Models and Algorithms for Robust PERT Scheduling with Time-dependent Task Durations Michel Minoux  387 Comparison of Search Strategies of Branch and Bound Algorithm for Concave Minimization Problems Under Linear Constraints Hiroshi Konno, Kazuo Izumi, and Rei Yamamoto  399 A Gagliardo–Nirenberg Inequality for Orlicz and Lorentz Spaces on Rn+ Ha Huy Bang and Mai Thi Thu 415 Robust Stability and Transient Behaviour of Positive Linear Systems D. Hinrichsen and E. Plischke 429 A Simplicial Algorithm for Concave Minimization and Its Performance as a Heuristic Tool Takahito Kuno and Yoshiyuki Shiguro  463 Convex Conjugation and Duality for the Solutions of a Functional Equation J.-E. Martínez-Legaz  481 Finite Semigroups with Infinite Product and Languages of Infinite Words Phan Trung Huy, Nguyen Quy Khang, and Do Long Van  495 On the Extremal Structure of an OSPF Related Cone Peter Broström and Kaj Holmberg  507 On Branch-and-Bound Algorithms for Global Optimal Solutions to Mathematical Programs with Affine Equilibrium Constraints Le Dung Muu and Nguyen Van Quy 523 A Homogeneous Model for Mixed Complementarity Problems over Symmetric Cones Yedong Lin and Akiko Yoshise 541 The Existence of $\varepsilon$-Solutions to General Quasiequilibrium Problems N. X. Hai and P. Q. Khanh 563 Contents for Volume 35 573

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