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CONTENTS Volume 34, Number4 December 2006 Recognizing Group Languages with OBDDs C. Choffrut and Y. Haddad  369 Some Periodicity of Words and Marcus Contextual Grammars P. Dömösi, G. Horv\'ath, Masami Ito, and Kayoko Shikishima-Tsuji 381 On the Approximability of Max-Cut Le Cong Thanh  389 Note on Maximal Nonhamiltonian Burkard-Hammer Graphs Ngo Dac Tan  397 Lower Semicontinuity of the KKT Point Set in Quadratic Programs Under Linear Perturbations G. M. Lee, N. N. Tam, and N. D. Yen 411 On Systems of Quasivariational Inclusion Problems of Type I and Related Problems Lai-Jiu Lin and Nguyen Xuan Tan 423 The Translational Hull of a Strongly Right or Left Adequate Semigroup X. M. Ren and K. P. Shum  441 A Blowing-up Characterization of Pseudo Buchsbaum Modules Nguyen Tu Cuong and Nguyen Thi Hong Loan  449 Generating of Minimal Unavoidable Sets Phan Trung Huy and Nguyen Thi Thanh Huyen  459 Stability of Associated Primes of Monomial Ideals Le Tuan Hoa  473 Integral Closures of Monomial Ideals and Fulkersonian Hypergraphs Ngo Viet Trung 489 Controllability Radii and Stabilizability Radii of Time-Invariant Linear Systems D. C. Khanh and D. D. X. Thanh 495

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