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References:
[1] A. Blikle: Equations in a space of languages. CC PAS Reports 43, Computation Center, Polish Academy of Sciences, Warsaw 1971.
[2] A. Blikle: Equations in nets-computer oriented lattices. CC PAS Reports 99, Computation Center, Polish Academy of Sciences, Warsaw 1973. Zbl 0263.68008
[3] Gh. Borcan: Sisteme de ecuatii intr-un spatiu de limbaje cu aplicatii la gramatici independente de context. Studii şi cercetări matematice 26 (1974).
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[5] S. Marcus: Algebraic Linguistics, Analytical Models. Academic Press, New York-London 1967. MR 0225610 | Zbl 0174.02402
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