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Aleshnikov S. I., Boltnev Yu. F., Ésik Z., Ishanov S. A., Kuich W.
formal languages, automata, semiring, formal power series,
matrix, xed point, !-algebraic system, !-algebraic power series, !-contextfree grammar, !-context-free language, transducer, rational transducer, algebraic transducer, transductions over starsemiringomegasemimodule pair.