Inducibility of the $n$-factor composition of frontier-to-root tree transformations. (English)
Mitt. Math. Ges. Hamb. 12, No.4, 1195-1206 (1991).
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The solvability of the equivalence problem for deterministic frontier-to- root tree transducers. (English)
Acta Cybern. 4, 167-177 (1979).
2