About the derivation languages of grammars and machines
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Characterizations of time-bounded computations by limited primitive recursion
In: Automata, languages and programming, Vol. 2.1974, page 280-293
The complexity of embedding graphs into binary trees
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On a subclass of pseudopolynomial problems
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Relationships between pushdown automata and tape-bounded turing machines
In: Automata, languages and programming, Vol. 1973, page 575-583
Simulating binary trees on x-trees
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