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Trends, Techniques, and Problems in Theoretical Computer Science
Juhani Karhumäki Lecture Notes in Computer Science, Trends, Techniques, and Problems in Theoretical Computer Science 281 26 (1987) https://doi.org/10.1007/3540185356_28
Balance of many-valued transductions and equivalence problems
Karel Culik and Juhani Karhumäki Lecture Notes in Computer Science, Mathematical Foundations of Computer Science 1986 233 264 (1986) https://doi.org/10.1007/BFb0016250
A simple undecidable problem: Existential agreement of inverses of two morphisms on a regular language