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

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