Complexity results for two-way and multi-pebble automata and their logics
ICALP '94 Selected papers from the 21st international colloquium on Automata, languages and programming
Jewels are Forever, Contributions on Theoretical Computer Science in Honor of Arto Salomaa
Typechecking for XML transformers
Journal of Computer and System Sciences - Special issue on PODS 2000
Tree-walking automata do not recognize all regular languages
Proceedings of the thirty-seventh annual ACM symposium on Theory of computing
Language and Automata Theory and Applications
Pebble alternating tree-walking automata and their recognizing power
Acta Cybernetica
Pebble Macro Tree Transducers with Strong Pebble Handling
Fundamenta Informaticae
Circularity, composition, and decomposition results for pebble macro tree transducers
Journal of Automata, Languages and Combinatorics
Nested pebbles and transitive closure
STACS'06 Proceedings of the 23rd Annual conference on Theoretical Aspects of Computer Science
Expressive power of pebble automata
ICALP'06 Proceedings of the 33rd international conference on Automata, Languages and Programming - Volume Part I
On multi-head automata with restricted nondeterminism
Information Processing Letters
Pebble Macro Tree Transducers with Strong Pebble Handling
Fundamenta Informaticae
Complexity of pebble tree-walking automata
FCT'07 Proceedings of the 16th international conference on Fundamentals of Computation Theory
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We consider various kinds of deterministic tree-walking automata, with and without pebbles, over ranked and unranked trees. For each such kind of automata we show that there is an equivalent one which never loops. The main consequence of this result is the closure under complementation of the various types of automata we consider with a focus on the number of pebbles used in order to complement the automata.