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Diekert, V. (1984). On hotz groups and homomorphic images of sentential form languages. In: Mehlhorn, K. (eds) STACS 85. STACS 1985. Lecture Notes in Computer Science, vol 182. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0023998
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DOI: https://doi.org/10.1007/BFb0023998
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