Invited Talks -- Iteration Semirings -- Various Aspects of Finite Quantum Automata -- On the Hardness of Determining Small NFA’s and of Proving Lower Bounds on Their Sizes -- Selected Ideas Used for Decidability and Undecidability of Bisimilarity -- The Frobenius Problem and Its Generalizations -- Well Quasi-orders in Formal Language Theory -- Contributed Papers -- On the Non-deterministic Communication Complexity of Regular Languages -- General Algorithms for Testing the Ambiguity of Finite Automata -- Emptiness of Multi-pushdown Automata Is 2ETIME-Complete -- The Average State Complexity of the Star of a Finite Set of Words Is Linear -- On the Computational Capacity of Parallel Communicating Finite Automata -- On a Generalization of Standard Episturmian Morphisms -- Universal Recursively Enumerable Sets of Strings -- Algorithmically Independent Sequences -- Relationally Periodic Sequences and Subword Complexity -- Bounds on Powers in Strings -- When Is Reachability Intrinsically Decidable? -- Some New Modes of Competence-Based Derivations in CD Grammar Systems -- The Synchronization Problem for Strongly Transitive Automata -- On the Decidability of the Equivalence for k-Valued Transducers -- Decidable Properties of 2D Cellular Automata -- Fixed Point and Aperiodic Tilings -- Extended Multi Bottom-Up Tree Transducers -- Derivation Tree Analysis for Accelerated Fixed-Point Computation -- Tree Automata with Global Constraints -- Bad News on Decision Problems for Patterns -- Finding the Growth Rate of a Regular of Context-Free Language in Polynomial Time -- More Concise Representation of Regular Languages by Automata and Regular Expressions -- A Taxonomy of Deterministic Forgetting Automata -- Provably Shorter Regular Expressions from Deterministic Finite Automata -- Large Simple Binary Equality Words -- On the Relation between Periodicity and Unbordered Factors of Finite Words -- Duplication in DNA Sequences -- On the State Complexity of Complements, Stars, and Reversals of Regular Languages -- On the State Complexity of Operations on Two-Way Finite Automata -- On the Size Complexity of Rotating and Sweeping Automata -- An Analysis and a Reproof of Hmelevskii’s Theorem -- Hierarchies of Piecewise Testable Languages -- Construction of Tree Automata from Regular Expressions -- Balance Properties and Distribution of Squares in Circular Words -- MSO Logic for Unambiguous Shared-Memory Systems -- Complexity of Topological Properties of Regular ?-Languages.