Table of Contents

Invited Talks.- Regular Functions.- Unambiguity in Automata Theory.- Contributed Papers.- Partial Derivative Automaton for Regular Expressions with Shue.- Upper Bound on Syntactic Complexity of Suffix-Free Languages.- Nondeterministic Tree Width of Regular Languages.- Integer Complexity: Experimental and Analytical Results II.- Square on ideal, closed and free languages.- A Tentative Approach for the Wadge-Wagner Hierarchy of Regular Tree Languages of Index [0,2].- Compressibility of finite languages by grammars.- On the Complexity and Decidability of Some Problems Involving Shue.- On the Computational Complexity of Problems Related to Distinguishability Sets.- Prefix-Free Subsets of Regular Languages and Descriptional Complexity.- Transducer Descriptions of DNA Code Properties and Undecidability of Antimorphic Problems.- On Simulation Costs of Unary Limited Automata.- On some decision problems for stateless deterministic ordered restarting Automata.- Quantum queries on permutations.- Complement on Free and Ideal Languages.- Universal Disjunctive Concatenation and Star.- Quasi-Distances and Weighted Finite Automata.- The State Complexity of Permutations on Finite Languages Over Binary Alphabets.- Star-Complement-Star on Prefix-Free Languages.- Groups whose word problem is a Petri net language.- Regular realizability problems and context-free languages.- Generalization of the Double-Reversal Method of Finding a Canonical Residual Finite State Automaton.- Quantum State Complexity of Formal Languages.