Algebraic and automata-theoretic properties of formal languages. Ginsburg, S. Elsevier Science Inc. New York, NY, USA, 1975.
bibtex   
@book{ginsburg1975algebraic,
    title={{Algebraic and automata-theoretic properties of formal languages}},
    author={Ginsburg, S.},
    year={1975},
    publisher={Elsevier Science Inc. New York, NY, USA}
  }

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